WELL DONE! YOU HAVE CHOSEN THE CORRECT ANSWER.

This is an example of a kicking infraction.  A subtle foul can cause you enormous game control problems.  Number 9 has already kicked the ball away and is slightly off balance.  All his weight is on one leg, commonly referred to as the plant leg.  The ligaments and tendons are stretched tight to hold up to the entire body weight and perhaps even stressed, fighting to regain balance.