The answer is D. Don't mention it, friend.
There are five verb moods: indicative, imperative, interrogative, conditional, and subjunctive.
In the imperative mood, a verb expresses a command, a request, or even a suggestion in a more direct way. The following are examples of the imperative mood:
- Drink your milk.
- Buy that pair of shoes.
- Don't forget your coat.
- Be silent.
