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

Correct option is D

No error.
Explanation: The sentence is grammatically correct. The subject "King penguins" agrees with the plural verb "are", and there are no issues with subject-verb agreement, word choice, or sentence structure.
Grammatical Confirmation: The sentence structure and preposition usage ("throughout") are appropriate in describing the activity of penguins during the summer days.
No correction needed: All parts of the sentence are error-free.