Alex Received a Four-Year Scholarship to State U

Alex received a four-year scholarship to State U. that covered tuition and fees, room and board, and books and supplies. If Alex becomes a full-time student, then:

A) attending State U. for four years is costless for Alex.
B) Alex has no incentive to study hard while at State U.
C) the opportunity cost of attending State U. includes the money Alex could have earned working for four years.
D) the opportunity cost of attending State U. includes the sum of the benefits Alex would have had from attending each of the other schools to which he was admitted.