The verb is "trudged".
It's the past simple form of the verb "to trudge" which is a type of a walk, usually slow and heavy as if you have weights on yourself.
The school cafeteria food is to expensive? Or maybe not good?
The correct answer is the fourth option. The other three are grammatically incorrect.
“I believe a longer spring break will help students perform better in school. After a week away from their studies, students will be refreshed and able to concentrate until the end of the school year”
This states your stance and reasoning.