Statement–Assumption — “Detergents should be used to clean clothes.” Assumptions: I. Detergents form lather. II. Detergents help to dislodge grease and dirt from fabric.
Correct Answer: if only assumption II is implicit.
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.