Statement–Assumption — “Reckless partying can lead to health problems and you may reach a hospital straight from the discotheque.” Assumptions: I. Heavy drinking is the main reason for such health problems. II. Sometimes dancing itself may lead to health problems.

Introduction / Context:
The statement warns that “reckless partying” can culminate in health problems serious enough to require hospitalization. In statement–assumption questions, we must identify only those underlying beliefs that are necessary for the statement to be sensible, not every possibility suggested by real life.

Given Data / Assumptions:

• “Reckless partying” is a broad phrase that can include sleep deprivation, dehydration, substance misuse, heat, overcrowding, or accidents.
• The statement does not specify a unique cause (e.g., alcohol) or a specific activity (e.g., dancing) as the main culprit.

Concept / Approach:
An implicit assumption must be indispensable. If the statement can still hold true without it, then it is not implicit. Here, the caution is general: any reckless behavior associated with intense parties may endanger health.

Step-by-Step Solution:
1) Test Assumption I (heavy drinking is the main reason): Replace heavy drinking with other reckless factors (extreme fatigue, dehydration). The warning still stands. Hence I is not necessary.2) Test Assumption II (dancing may lead to health problems): Even if no one danced (say, it was a loud overnight gathering), “reckless partying” could still cause trouble. Thus II is not necessary.3) Since the caution remains valid without I or II, neither is implicit.

Verification / Alternative check:
Public-health advisories often avoid pinpointing a single cause when multiple risk pathways exist; they merely flag danger from overall recklessness.

Why Other Options Are Wrong:
I-only/II-only/Either/Both attribute singular or specific mechanisms that the statement never requires.

Common Pitfalls:
Equating “party risk” exclusively with alcohol or dancing; ignoring other hazards like fatigue, crowding, or heat stress.

Final Answer:
if neither I nor II is implicit.