Thwart: To oppose or prevent.
To thwart any outsiders from intruding, I built this wall made of broken bottles.
Buffy realized if the news of the scandal got out it would thwart her chances of becoming the president.
Answer:
A makes the most sense to me in this question but I would go over it with someone else before submitting it if I was you
Explanation:
The simple predicate of the sentence "Most nurses work in hospitals" is 'work'
