Idioms and Phrases - Verbal and Reasoning

Some proverbs/idioms are given below together with their meanings. Choose the correct meaning of proverb/idiom, If there is no correct meaning given, E (i.e.) 'None of these' will be the answer.
Q1:

To hit the nail right on the head

A To do the right thing

B To destroy one's reputation

C To announce one's fixed views

D To teach someone a lesson

E None of these

ANS:A - To do the right thing

To do exactly the right thing; to do something in the most effective and efficient way.