Of
the
What causes CTE?
O Brain injury from 1-3 serious concussions
O
The stress of constantly being cut from teams and moving around
O Brain injury from multiple head collisions over time
O Bone and joint damage from multiple body collisions over time

Explanation:

what does brain injury have to do with English

sing because that is what they are doing in the sentence

explanation:

the simple predicate is the main verb in the predicate that tells what the subject does. example: my father fixed the dryer. read each sentence. draw a line under the complete predicate.