Read the passage and mark the letter A, B, C or D on your answer sheet to indicate the best answer to each of the following questions from 1...

Read the passage and mark the letter A, B, C or D on your answer sheet to indicate the best answer to each of the following questions from 19 to 28.

The cacophony of horns is a defining feature of rush hour in Hanoi and Ho Chi Minh City, a relentless aural assault. At major intersections, a solid mass of stagnant metal forms as vehicles become ensnared. Motorbikes, prolific and agile, fill every conceivable crevice between cars and buses in a desperate attempt to gain inches. Engines idle, pumping acrid exhaust into the oppressive humidity, a situation that becomes intolerable during the frequent heatwaves. The traffic light, cycling through its futile sequence, becomes an irrelevant suggestion, devoid of any perceptible authority. [I] The system has functionally collapsed under the sheer volume of commuters.

A delivery driver, his patience visibly exhausted by the protracted delay, makes a pragmatic decision. He abruptly mounts the curb, maneuvering his vehicle onto the crowded pavement with practiced ease. Pedestrians instinctively recoil against shopfronts, ceding the space without protest. [II] His action is not anomalous; it is a spontaneous and widespread response to the intolerable standstill. He is immediately followed by a swarm of other motorbikes, a sudden incursion onto a space nominally reserved for walking. The sidewalk is instantaneously repurposed as an auxiliary traffic lane, its original function obliterated by collective necessity.

The fragmentation of order is swift and contagious. The pavement is now a fully-fledged channel for two-wheeled vehicles, forcing pedestrians into shop doorways or onto the road itself. In retaliation, drivers in the opposing lane, seeing their own path obstructed by the spillover, begin to aggressively encroach upon the intersection. They form a new, impenetrable barrier, precluding any possibility of movement for those who ostensibly hold the right-of-way. [III] A perverse stalemate is achieved, born from thousands of disparate, uncoordinated, self-interested calculations. The intersection becomes a locked puzzle, each piece immovable.

In the near distance, the insistent wail of an ambulance siren becomes audible. The sound grows more desperate, fluctuating in volume, yet the emergency vehicle remains unseen, ensnared somewhere in the impassable mass. The gridlock is now total and claustrophobic. No one can move forward; no one can retreat. [IV] The collective impatience has created a situation of collective paralysis. The chaos has become its own inescapable trap, a mundane daily calamity that plagues the city's main thoroughfares. Commuters, resigned to the delay, sit in the humid, polluted air, the economic cost of lost hours mounting in a vast, uncalculated tally. The intractable problem will eventually, inexorably, dissolve, only to reform with predictable certainty at the next junction.

(Adapted from vietnamnews.vn)

Question 19: According to paragraph 1, amidst the gridlock of Vietnam's urban peak periods, the operators of motorbikes ________.

A. generate a block of immobile vehicles by squeezing into every possible space
B. leverage their mobility to occupy any open space for even minimal progress
C. get trapped in the congestion while trying to comply with the changing signal cycles
D. release engine fumes as a strategy to avoid the intense climate conditions