C because he has frustration the entire time
D.she developed the theory of radioactivity.
The prefix "de-" means to deduct, or remove from. So, de- + attach, would mean to remove something from holding on to another thing. Apply that to the situation, and the pedal straps "detach", meaning they stop holding on to his ankle. Petal straps connect Andre's foot to his pedals, but when he falls, they disconnect, and the strap no longer holds his foot to the petal. Basically the word detach means to release hold of his foot, so the petals no longer hold his foot to his bike.
