Which is the stimulus in the following situation?

A basketball player trains shooting baskets for years. In a big game, at the end of the second half, a teammate passes the ball to him. The player sees that the clock is running down. Realizing that the game is almost over, he instantly decides to shoot, even though he is nearly at midcourt. He scores, and his team wins the game.
A. the player's training
B. the player's shot
C. the victory
D. the clock