Choose the sentence containing Adverb of Reason from the following options:

He therefore left the school.

The correct answer is Option (1) - He therefore left the school.

An Adverb of Reason explains why something happens. In the sentence "He therefore left the school," the word "therefore" provides the reason for leaving the school, making it an adverb of reason.

Options:

1. He therefore left the school.

   • Correct: "Therefore" explains the reason for the action, qualifying it as an adverb of reason.

2. He certainly went.

   • Incorrect: "Certainly" is an adverb of affirmation, not of reason.

3. I am rather busy.

   • Incorrect: "Rather" is an adverb of degree, not of reason.

4. You are quite wrong.

   • Incorrect: "Quite" is an adverb of degree, not of reason.