Write a question about the following article.

Bolt was just as surprised as all of us about how fast he ran . Test Usain Bolt all you want . There wo n't be any illegal substances in his body . Not only do I believe he is clean , he has to be clean .

Question:
Why would some doubt Usain Bolt 's integrity ?
Select from:
a). He was caught with substances that are illegal ..
b). None of the above choices ..
c). He runs so fast ..
d). He was in possession of illegal drugs ..