29Directions: Read the passage carefully and answer the given question.…

In critical reasoning, an assumption is an unstated premise that an argument's conclusion silently depends on. The standard test for a genuine assumption is the negation test: deny the candidate statement and check whether the argument still stands. If denying it makes the argument collapse, it is a necessary assumption; if the argument survives, it is not.

Here, the passage argues that governments are promoting electric vehicles to cut urban air pollution and reduce fossil-fuel dependence, while naming limited charging infrastructure, high cost, and uneven electricity supply as the barriers currently slowing adoption. This reasoning only holds together if removing those very barriers, particularly building better infrastructure, is expected to actually drive wider adoption. Applying the negation test: assume instead that improved infrastructure would NOT encourage wider adoption. If that were true, the entire strategy of addressing these barriers to promote electric vehicles would serve no purpose, so the argument collapses. That confirms the link between infrastructure and adoption is a necessary, implicit assumption.

• Electricity generation is completely pollution-free: too strong to be required, since even partly-clean electricity still cuts urban air pollution by moving emissions away from cities; the argument survives its negation.

• People are unwilling to use public transport: irrelevant, since the passage never compares electric vehicles with public transport, and commuter attitudes toward public transport play no part in the stated goals.

• Fossil fuel prices will remain constant: not needed, and if anything works the other way, since rising fuel prices would strengthen rather than weaken the case for electric vehicles.

• Electric vehicles are suitable only for urban areas: contradicts the passage's own aim of large-scale adoption, which implies a nationwide push rather than an urban-only limit.

Only the assumption that fixing the infrastructure gap will actually widen adoption survives the negation test, so it is the implicit assumption underlying the government's promotion of electric vehicles.