In the following question, the given sentence has four parts marked P, Q, R and S. Choose the part of sentence with the error and mark as your answer. If there is no error, mark 'No error (S) ' as your answer.
Earth's deserts (P) / is a land of extremes,(Q) /constantly pushing life to the limit. (R) / No error (S)

Correct option is B

Option (b) contains an error.
Explanation: The verb "is" is incorrectly used for a plural subject "Earth's deserts." The correct verb form should be "are" to match the plural subject "deserts."
Grammatical rule used: Subject-verb agreement: Plural subjects require plural verbs, and singular subjects require singular verbs.
Example:
Incorrect: The dogs is barking.
Correct: The dogs are barking.