Select the most appropriate option that can substitute the highlighted segment in the given sentence.
He possesses one of the slimmer handsets in the world.

Correct option is B

The correct substitution of the highlighted words is (b) slimmest.
Explanation: When comparing one item among all, the superlative degree is used — “slimmest.” "Slimmer" is comparative, and "most slimmest" is grammatically incorrect due to double comparison.
Grammatical rule used: Use superlative degree (“-est” or “most”) when comparing one among many.
Example: She bought the cheapest bag in the store.