Work this one out

[FredFan7]

3rd and 10 from the A five yard line. QB A15rolls out in the endzone, and A68 commits holding in the endzone.

A15's pass is intercepted by B24 and he returns it for a TD.

A. After the interception and during the return B55 commits a block in the back at the A 2 yard line.

B. After A24 reaches the endzone he spikes the ball drawing a dead ball USC.

In each situation, what are the penalty options for each team and where will be next ball be snapped.

NFHS please.