In the following question, each 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.
King penguins (P) / are active throughout (Q) / the long summer days. (R) / No error (S)

Correct option is D

There is no error in the sentence.
Explanation: The sentence is grammatically correct. The subject "King penguins" is plural, and the verb "are" agrees with it. There are no errors in tense or subject-verb agreement.
Grammatical rule used: Subject-verb agreement and sentence structure are correct.
Example:
King penguins are active in the wild.