The idiom "Hit the nail on the head" is commonly used in English to describe a situation where someone provides an accurate or precise explanation or assessment, effectively addressing the essence of a topic or a problem. When you "hit the nail on the head," you are essentially saying exactly the right thing and responding appropriately to the context.
Given the options:
The correct meaning of the idiom is "Say exactly the right thing."
Rearrange the following parts to form a meaningful and grammatically correct sentence:
P. a healthy diet and regular exercise
Q. are important habits
R. that help maintain good physical and mental health
S. especially in today's busy world