Which of the Following Would Represent a Cost of Compulsory

Which of the following would represent a cost of compulsory education?
(i) reduced crime rates
(ii) the fact that students being compelled to attend school may interfere with the learning of more serious students
(iii) lost wages that a dropout could earn waiting on tables at the local cafe

A) (i) and (ii)
B) (ii) and (iii)
C) (i) and (iii)
D) (i) , (ii) and (iii)