I am racking my brain on the following question any help would be much appreciated.

The question is: Which of the following infringements at a line out should be penalized with a free kick.

A) A player, obstruct and opponent who is jumping for the ball players, close the gap in a line out before the ball is thrown

B) a player places a hand on the shoulder of an opponent to use him as a support when jumping for the ball

C) players close the gap in a line out before the ball is thrown

D) a player in the line out crosses the 15 meter line before the line out has ended and the ball is not thrown beyond that line

E) a player jumps, and it supported before the ball has been thrown in