The opportunity cost of earning an advanced college degree is that: Options:

a), You will earn more income during your career

b), You will earn less money during the years that you are in college

c), Some fields require a professional degree before you can begin working

d), There may be a low supply of jobs in your professional field

a social contract.

"a social contract is an agreement between citizens and their leader where the citizens give up certain freedoms in exchange for protection. the constitution of the united states is an example of a social contract."

c. the u.s. railroad administration

c. it inspired germany and austria-hungary to join the triple entente.