Her father is not home yet. She is pretty sure that he is on his way.

Explain:

Her father hasn’t come home yet. She was pretty sure he was on his way.

A. Her father might be on his way because he hasn’t come home yet.

B. Her father must have been on the road because he hasn’t come home yet.

C. Her father must be on the road because he hasn’t come home yet.

D. Her father may have been on the road because he hasn’t come home yet.

→ Choose the answer C