Read each of the following four sentences to find out whether there is any grammatical mistake/error in it. Choose the sentence with no grammatical error as the correct answer. If all the given sentences are grammatically incorrect, choose option “All are incorrect” as the answer.

Correct option is B

The correct answer is: “John's new apartment is bigger than his old one.”
(a) The cat curled up in it's bed, purring softly.
Error: The possessive form of "it" is "its," not "it's." "It's" is a contraction of "it is" or "it has."
Correction: The cat curled up in its bed, purring softly.
(c) She can sing good enough to impress the judges.
Error: The adjective "good" should be replaced with "well" when describing the ability to sing.
Correction: She can sing well enough to impress the judges.
(d) The students were asked to raise they're hands.
Error: "They're" is a contraction of "they are." The correct term here is "their," indicating possession.
Correction: The students were asked to raise their hands.