Which of the following choices is the BEST example of a qualified cause / effect claim?
Select one:

a.
The cause of high drop-out rates at colleges and universities is student financial strain.

b.
High drop-out rates at colleges and universities are caused by students not having enough financial resources to pay for school and living expenses.

c.
Students drop out of school because they don't have sufficient financial resources to pay for school in addition to living expenses.

d.
One of the causes associated with drop-out rates at colleges and universities is that students may lack sufficient financial resources to pay for school in addition to living expenses.