Directions: Four alternatives are given for the idiom/phrase underlined in the sentence. Choose the alternative which best expresses the meaning of the idiom/phrase.

He was completely at sea about the cause of her death.

Explanation for option 1: This does not express the best meaning of “at sea”. Hence, this is incorrect. Explanation for option 2: “At sea” means in a state of confusion. Hence, this is correct. Explanation for option 3: This does not express the correct meaning of the underlined part. Explanation for option 4: “At sea” does not mean “certain”. Hence, this is incorrect.