Statement — Most of the mobile phones in that shop are costly.\nQuestion — Which conclusion is necessarily true?

Introduction / Context:
“Most” means more than half. From this, we can safely infer the existence of at least one costly phone. Claims about specific brands or about zero cheap phones go beyond the data.

Given Data / Assumptions:

• Quantifier: Most phones in the shop are costly.
• No specific brand is mentioned.

Concept / Approach:
Existential inference: “Most P are Q” entails “Some P are Q.” Whether some are cheap cannot be concluded with absolute certainty in strict syllogistic terms here; the only safe necessity is “some costly exist.”

Option Check:

Final Answer:
Some of the mobile phones in that shop are costly