The following sentence has been split into four segments. Identify the segment that contains a grammatical error.
The gold watch / look really expensive / and is not affordable / for common people.

Correct option is D

The subject “The gold watch” is singular, so the verb must agree with it in number. The verb “look” is plural and incorrect for a singular subject.
Incorrect: The gold watch look really expensive.
Correct: The gold watch looks really expensive.
Grammar Rule:
Singular subjects take singular verbs (verb + 's' in present tense).
Example: She looks tired. (Not look)