Statement : The government wants to start the bullet trains. Assumption I : A large number of rail passengers are expected to use bullet trains. Assumption II : Many people will switch from air travel to bullet train.

The correct answer is (A) Only Assumption I is implicit.

• Logical Principle: An assumption is an unstated premise that justifies the logic of a statement. For a government project like a bullet train to be initiated, the primary expectation is public utility and necessity (demand), while migration from other transport modes is a secondary possibility, not a guaranteed prerequisite.
• Deduction: Assumption I is implicit because, for any large-scale infrastructure project, there must be an expectation of sufficient ridership to justify the investment. Assumption II is not necessarily implicit because the decision to start a bullet train is based on the demand for high-speed connectivity, not solely on diverting traffic from air travel, which is a different market segment.
• Verification: Option (A) is correct as it identifies that the foundational requirement is user demand. Options (B), (C), and (D) are incorrect because they incorrectly assume that the decision relies on diverting airline passengers, which is a subjective and unconfirmed expectation.