The teacher said, “Surabhi, where are you going to spend your summer break.

The teacher asked Surabhi where she is going to spend her summer break.
The teacher asked Surabhi where was she going to spend her summer break.
The teacher asked to Surabhi where she was going to spend her summer break.
The teacher asked Surabhi where she was going to spend her summer break.

The correct answer is: A. The teacher asked Surabhi where she is going to spend her summer break.

The teacher is using the present tense verb “are going” to ask Surabhi about her plans for the future. The teacher is not asking about Surabhi’s past plans, so the past tense verb “was going” is not correct. The teacher is also not asking Surabhi to do something, so the infinitive verb “to spend” is not correct.

The teacher is asking Surabhi a question, so the sentence should end with a question mark.