Answer:
Your answer should be C. Will be traveling
Step-by-step explanation:
A makes no sense, since it says tomorrow, which means in the future, and it says traveled which means past basically, so it cannot be A.
B makes no sense, the grammar is not correct, and you would not say "will traveling". So, it cannot be B.
C makes the most sense out of the questions, since it has correct grammar. So it SHOULD be C.
D is also a good answer, but I would go with C.
Hope this helps.