more an athlete than or more of an athlete than

[hoangkha]

Hi, teachers!
-She is....................a spectator.

A	more an athlete than	B	more of an athlete than
C	an athlete more than	D	an athlete of more than

The key is B, but I am wondering why A is incorrect?

 

[Rover_KE]

I'd say only D is incorrect.

Rover