Answer:
I think it's D, "It motivates him to start his research."
Step-by-step explanation:
I took the test, and I was debating over B, "It motivates him to try to become smarter." and D. I picked B, and it was wrong, and both makes sense, so I'm guessing it was the other one, or D.
Sorry I was late, but I thought I knew the answer, so I wanted to hopefully help anyone out there who might need it. Have a great rest of your day! \(^u^\)