In the following question, the given sentence has four parts marked P, Q, R, and S. Choose the part of the 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.
Error Identification: The singular verb "is" is incorrect when referring to the plural noun "Earth's deserts."
Grammatical Explanation: The subject "deserts" is plural, and thus, the verb must also be plural ("are" instead of "is").
Corrected sentence: "Earth's deserts are a land of extremes."
Explanation: The subject "deserts" is plural, so the verb must agree in number. "Are" should be used to match the plural subject.