Critical Reasoning — Implicit Assumptions Safety announcement in a ropeway trolley: “For your own interest, please fasten your seat belts while seated.” Assumptions to evaluate: I. People are always careful about their own safety. II. Unless advised, passengers might not use the seat belts.

Introduction / Context:
Transport operators issue safety instructions to reduce risk. We test which background beliefs are necessary for the announcement to be purposeful.

Given Data / Assumptions:

• Passengers are advised to fasten seat belts.
• Assumption I: people are always safety-conscious.
• Assumption II: without advice, some passengers might not fasten belts.

Concept / Approach:
A safety announcement presupposes that compliance is not automatic and that guidance can increase safe behavior. It does not require the belief that people are always safety-focused; in fact, the instruction exists precisely because some are not.

Step-by-Step Solution:

Verification / Alternative check:
Negate II: passengers will use belts anyway—the announcement becomes redundant. Negate I: people are not always careful—the announcement still makes sense. Therefore only II is implicit.

Why Other Options Are Wrong:

• Only I / Either / Neither / Both: These ignore the practical rationale for safety reminders and misstate the necessity.

Common Pitfalls:
Reading “in their own interest” as proof that people are always careful. It is persuasive wording, not a logical claim about universal behavior.

Final Answer:
Only assumption II is implicit