How Is the Unemployment Rate Related to the Opportunity Cost

How is the unemployment rate related to the opportunity cost of college?

A) As the unemployment rate increases, the opportunity cost of attending college falls because fewer opportunities for employment exist.
B) As the unemployment rate decreases, the opportunity cost of attending college falls since it becomes easier to pay for tuition when employed.
C) As the unemployment rate increases, the opportunity cost of attending college increases because fewer people are giving up the opportunity of working to attend college.
D) As the unemployment rate increases, the opportunity cost of attending college increases because more people are giving up the opportunity of working to attend college.