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 .

Based on the preceding passage, choose your answer for question Why would some doubt Usain Bolt 's integrity ?
Available options: A). He is so insanely good . B). None of the above choices . C). He was caught with substances that are illegal . D). He was in possession of illegal drugs .
The answer is:
A).