Find out whether there is any grammatical error in below sentence. Since it was his first election campaign, the candidate was confused; / none could clearly understand / either the principles he stood for or the benefits he promised.

The correct answer is: D. No error

The sentence is grammatically correct. The conjunction “either…or” is used to join two alternatives. In this case, the alternatives are “the principles he stood for” and “the benefits he promised.” The sentence is saying that no one could clearly understand either the principles the candidate stood for or the benefits he promised.

Option A is incorrect because it does not include the conjunction “either…or.” Option B is incorrect because it does not include the subject “none.” Option C is incorrect because it does not include the verb “could.”