PLZZZZ HELPPPP !!!!!!!

Imagine a mental picture of someone engaged in the intellectual activity of trying to learn what the rules are for how to play the game of chess.

The sentence above should be revised into
A.
Imagine someone trying to learn what the rules are for how to play the game of chess.
B.
Imagine someone trying to learn how to play chess.
C.
Imagine someone engaged in the intellectual activity of trying to learn the game of chess.
D.
Imagine someone engaged in the intellectual activity of trying to learn what the rules are for how to play the game of chess.