NFHS Question need ruling. Thanks again

[zebra5150]

Ok guys here is another one. Please help. Thanks for all your help so far.....


K9’s punt is high and short. R4 moves up to try and catch it on the fly, signaling a fair catch as he does so. K4 inadvertently gets in R4’s way and he is unable to get to the punt, which strikes the ground beyond the neutral zone, and then rebounds behind it. K9 grabs the ball and begins to run. He is hit and fumbles, and R2 recovers and begins to advance, finally brought down on the K 26. During the play R4, the player who originally signaled for the fair catch, (a) pushed K3 in the back above the waist in an effort to get to the loose ball, or (b) grabbed K9’s facemask before K9 fumbled and R2 recovered, or (c) held K3 during R2’s advance.