Respuesta :

dumbdumbkylee

Answer:

The answer is A because the muscles are needing to twitch with the movement of the rope and then tighten to be able to grab a hold better

Explanation:

dcrim1972

Answer:

my best guess would be D:  contract and relax

Explanation:

(pull and release example)...you are pulling against the other (contracting...kinda like a muscle cramp)...and then relaxing so you can gain more momentum to pull again.

Hope that explains a little better