Zart Zap - E Discard 1 momentum: If this attack deals damage, ready up to 2 foundations in your staging area that have not been readied this Combat Phase.

Feet of Fury - R Commit: After your attack deals 4 or less damage, draw 1 card. If your attack is a kick, draw 2 cards instead.

Situation A 1) attack deals damage. 2) ready Feet of Fury due to Zart Zap's effect. 3) React with Feet of Fury to draw cards.

Situation B 1) attack deals damage. 2) React with Feet of Fury to draw cards. 3) ready Feet of Fury due to Zart Zap's effect.

Situation C 1) attack deals damage. 2) React with Feet of Fury to draw cards. 3) ready Feet of Fury due to Zart Zap's effect. 4) React again with Feet of Fury and draw more cards. 5) ??? 6) profit.

Now, I understand that both A and B can probably work, but what about C?

A and B both work.

C does not, as you cannot play the same ability from the same card during one window. That is, you can't respond with the same Feet of Fury to the same trigger, just like you can't take the free enhance on one copy of Lord of the Makai twice during the same attack.

B cannot work, the continuous effect of Zart Zap must resolve before the window for Response abilities on the same trigger will open.