Statement: “Look under your seat. There could be a bomb. Raise the alarm. Earn reward.” — a written instruction to bus passengers Assumptions I & II: I. Passengers will read the instruction and may abide by it. II. Passengers’ participation may enhance overall security. Choose the option that correctly identifies which assumption(s) is/are implicit.

Introduction / Context:
Notices and instructions in public places rest on background beliefs about how people behave and whether their actions can meaningfully affect outcomes. Here, bus passengers are told to check under seats for a possible bomb, raise an alarm, and are promised a reward. We must decide which assumptions are required for this instruction to make sense.

Given Data / Assumptions:

• I. Passengers will read the message and may comply.
• II. Passenger participation improves security (threat detection/response).

Concept / Approach:
An assumption is implicit if the directive would lose its practical point without it. Public-security messages presuppose audience attention and that laypeople can contribute to safety by reporting suspicious objects or activity.

Step-by-Step Solution:
1) The instruction is purposive only if passengers are expected to see and follow it (I). If no one reads or acts, posting is futile.2) The call to “look under your seat” and “raise alarm” presumes that such vigilance from passengers can reduce risk by early detection (II).3) The reward clause further signals that compliance is expected and valuable, reinforcing both I and II.4) Therefore, both assumptions underpin the rationale of the notice.

Verification / Alternative check:
If passengers neither read nor comply, the notice cannot achieve security aims. If their participation cannot improve security, the instruction and reward are pointless. Thus both I and II must hold for the instruction to be sensible.

Why Other Options Are Wrong:
Only I: ignores the logic that participation must add security value. Only II: ignores the need for readership/compliance. Either I or II: both are required. Neither: contradicts the very purpose of posting the instruction.

Common Pitfalls:
Confusing “necessary” with “sufficient.” The assumptions need not guarantee total safety; they only need to hold for the directive to have point.

Final Answer:
Both I and II are implicit.