According to Thompson’s great success of Unix, what do you think of the reason of his

According to Thompson’s great success of Unix, what do you think of the reason of his success？

A.His success has nothing to do with hard working it happens because of luck.

B.His success cannot be copied or imitated because the time he was in cannot be copied.

C.His success needs hard work as well as serendipity. .

D.His success is all about timing.