One Reason an Individual Labour Supply Curve May Be Backward-Sloping

Multiple Choice

One reason an individual labour supply curve may be backward-sloping is that:
(i) work hours decline as technology raises worker productivity
(ii) a raise may prompt a person to devote more time to leisure than to work
(iii) a wage fall may cause a person to not work as hard

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