The apartment complex consisted of individual buildings , with apartments which were accessed from inside a common entry way . I pulled my bike in , placed it by the door , and went into the apartment to make a phone call . When I returned ( less than a few minutes later ) , the bike was gone .
Why was the bike stolen ?
A. It was n't locked up at all .
B. None of the above choices .
C. The thief knew the lock combination .
D. The narrator left it on the grass .


A