Statement–Assumption — “Detergents should be used to clean clothes.” Assumptions: I. Detergents form lather. II. Detergents help to dislodge grease and dirt from fabric.

Introduction / Context:
The recommendation to use detergents is justified if detergents actually aid cleaning performance.

Given Data / Assumptions:

• Lather is a visual cue but not the mechanism of action.
• Surfactants in detergents reduce surface tension and emulsify oils/particulates.

Concept / Approach:
An implicit assumption is what must hold true for the advice to be rational. The essential property is cleaning efficacy (grease/dirt removal), not whether foam appears.

Step-by-Step Solution:
1) I (forms lather) is non-essential; many low-foam detergents clean effectively.2) II (dislodges grease/dirt) is essential; without it, the recommendation has no basis.

Verification / Alternative check:
Efficacy depends on surfactant chemistry, not foam volume.

Why Other Options Are Wrong:
I-only/Either/Both/Neither either elevate a cosmetic property or ignore the functional premise.

Common Pitfalls:
Equating suds with cleaning power.

Final Answer:
if only assumption II is implicit.