(Last Word) in Examining the Relationship Between Student Loans and College

(Last Word) In examining the relationship between student loans and college tuition, researchers found that

A) increases in tuition costs caused an increase in student borrowing.
B) increases in student borrowing caused tuition costs to rise.
C) while student borrowing and tuition costs have both risen over time, there is no causal relationship between the two.
D) subsidizing the supply of higher education has increased both tuition costs and student borrowing.