Correct Answer: Do something exactly right

Solution : The fourth option is the correct choice.

When someone uses the idiom hit the nail on the head, it typically implies that the person has accurately identified or addressed the central or crucial aspect of a situation, problem, or statement.

In other words, it signifies precision and correctness in understanding or actions, akin to hitting a nail directly on its head for accuracy.

Therefore, the correct answer is, do something exactly right.