I NEED HELP ASAP!! PLEASE! Which piece of evidence could BEST be used to describe the claim below?

Claim: For many children working in agriculture, they are too exhausted to concentrate on their daily schoolwork.

Question 2 options:

a) Some leave their homes in March or April and do not return until September or October causing them to enroll in different schools; some even move to different states.

b) They spend hours each day in the fields before and after class and on weekends.

c) Credits and coursework do not always transfer from one school to another; some migrant students end up having to retake certain classes.

d) Some students skip school altogether or drop out, even though they are not supposed to.