The game is more important than the winning of the prize.

The correct answer is option number B

Remove `the'.Article the is used to emphasize something.Or when we want to indicate/address the same thing or person which we had talked about before in the sentence.

When we use `than', construction should be same as per the rule of parallelism.

Gaming -is the present participle of game.

And winning is an adjective.

The game here means the our will to participate.