He kept his eyes peeled and his ears pricked for some important clue.

The correct answer is A. hint.

A hint is a small piece of information that gives you an idea about something else. In this case, the man is looking for a small piece of information that will give him a clue about what is going on.

The other options are not correct because they are too strong. A notable clue is a clue that is important or significant. A remarkable clue is a clue that is amazing or surprising. A sensational clue is a clue that is

In this case, the man is not looking for a clue that is important, significant, amazing, surprising, or exciting. He is just