When I came back up , I heard enthusiastic WEE - OO - WEE - OO coming from his room . I popped my head in there and he made the noise at me and grinned . I asked " Firetruck ? "
Why might he make that sound ?
Pick the best answer from the following options:
A. I said " firetrucks " so he made the noise .
B. He was playing make - believe with himself .
C. I like firetrucks so he made the noise .
D. He felt enthusiastic that I was in his room .


B