According to the statement, extension, and elaboration method for elaboration, which sentence is a statement?

The answer to the question given is letter C.
According to the Statement, Extension, and Elaboration method for elaboration, " Ellen is a skillful and accomplished cello player." is a statement.

Here are the choices to this question:
A. Ellen plays the cello with the city youth orchestra and teaches younger students the basics of the instrument.
B. Ellen has studied the cello since she was six years old.
C. Ellen is a skillful and accomplished cello player.

Ithink it's a. but i could be wrong because it might be b. but it's not the other two