Kickoff: touchback or fumble

[sm_bbcoach]

NF rules in the kicking game

K87 kicks off. R34 is under teh ball and setting to receive it standing at his own 2. As R I am on the goal line (as I should be). As the kick comes down, R34 steps back to catch the ball with his left foot. As he is getting ready to catch the ball, his left heel is crossing the plane of the GL but not touching it. Here are the scenarios:

A) He catches the ball, and heel comes down on the GL

B) The ball hits his chest, he dropps the ball it lands in the end zone K recovers.

C) Ball hits his chest, he drops the ball K recovers.

D) Ball hits chest, he drops it, ball loose in end zone, picked up by R23. As he attempts to run ball out, R67 holds K45 in end zone. R23 ends up on R 44 yard line.

Calls?? Good luck!