Statement–Assumption (Ad Claim: “Buy Y TV for better sound quality”): Statement: “Buy ‘Y’ TV for better sound quality.” — an advertisement. Assumptions: I) ‘Y’ TV is the only TV in the market. II) ‘Y’ TV is the costliest. III) People generally ignore such advertisements.

Introduction / Context:
Advertisements commonly highlight a product attribute to influence purchase decisions. We must identify which given statements are tacitly assumed by this specific ad text.

Given Data / Assumptions:

• Claim focuses on “better sound quality.”
• No comparative pricing or exclusivity is stated.
• No statement about audience behaviour like “ignoring ads.”

Concept / Approach:
An assumption must be necessary to the ad’s persuasive intent. The ad only needs to assume that potential buyers value sound quality and may be responsive to advertising. However, none of the listed choices encode precisely those natural assumptions; instead, they test for exclusivity, price, or cynicism about ads—all not required.

Step-by-Step Solution:
I: “Only TV in the market” is a very strong and unnecessary claim; the ad merely positions Y TV as superior in sound, not unique in existence.II: “Costliest” is unrelated to sound quality claims and not needed for persuasion.III: “People generally ignore such ads” contradicts the point of advertising and is certainly not assumed by the advertiser.

Verification / Alternative check:
An ad can be effective without market exclusivity or premium pricing; and it presumes at least some audience attention, not general disregard. Therefore none of I–III must hold.

Why Other Options Are Wrong:
Any single-option choice (I, II, or III) imports irrelevant or contradictory claims as “assumptions.”

Common Pitfalls:
Confusing typical background assumptions (customers value quality) with the specific, extreme statements listed in options.

Final Answer:
None is implicit.