At this time on next Sunday, you . . . . . travelling by plane to the moon.

A. are

B. were

C. will be

D. will being

Answer: Option C

Solution(By Examveda Team)

Sentence is in Future continuous tense.
Rule :
Subject + will/shall + be + V-ing + other agents.
At this time on next Sunday, you will be travelling by plane to the moon.