Which of these sentences includes an abstract noun in its context?
the girl stared curiously at the box in her hand.

john thought his sophistication would win the love of ellen.

the young man was given a new car.

tom asked jennifer to look in the mirror at her hair.

The answer is the 2nd sentence, "John though his sophistication would win the love of Ellen."

Here's why:

abstract noun: a noun denoting an idea, quality, or state rather than a concrete object.

Sentence 1: the noun is "box", a concrete object.
Sentence 2: the noun is "sophistication", which is a quality, not a concrete object.
Sentence 3: the noun is "car", which is a concrete object.
Sentence 4: the noun is "mirror", a concrete object.