Statement–Assumption — “Have fun this New Year’s Eve, but not at others’ cost.” — Delhi Police Assumptions: I. Generally, people celebrate New Year’s parties at others’ expense. II. People will celebrate New Year’s Eve enthusiastically, posing a risk of causing trouble or costs to others unless warned.

Introduction / Context:
This is a cautionary public message: enjoy, but avoid harming or inconveniencing others. We must check which assumptions are indispensable for issuing such an advisory.

Given Data / Assumptions:

• Public celebrations occur on New Year’s Eve.
• Some behaviors can externalize costs (noise, vandalism, drunk driving, harassment), hence the caution.
• The message is preventive, not accusatory.

Concept / Approach:
For advisories, it is sufficient that risky behavior might occur; it is not necessary that “generally” people party at others’ expense (that is too strong). Nor must we assume any particular intensity (“with a bang”)—the advisory stands regardless.

Step-by-Step Solution:
1) Assumption I: “Generally at others’ expense” overgeneralizes and is unnecessary; advisories target potential, not universal, misconduct. Not implicit.2) Assumption II: The precise phrasing “will enjoy … with a bang” is not required; the advisory works even without asserting exuberant celebrations. Not implicit.3) Therefore, neither assumption is implicit.

Verification / Alternative check:
Public notices often state “do X, but responsibly” without presuming widespread wrongdoing or guaranteeing particular celebration styles.

Why Other Options Are Wrong:
I-only/II-only/Both/Either import stronger claims than necessary for a standard caution.

Common Pitfalls:
Confusing a preventive guideline with a claim about what “generally” happens; reading exaggerated language into a neutral advisory.

Final Answer:
if neither I nor II is implicit.