Give an example of a secondary reinforcer and explain the circumstances under which it may have been paired with a primary reinforce. (p. 91)
a) Money as a secondary reinforcer, paired with the primary reinforcer of food through purchases
b) Social praise as a secondary reinforcer, paired with the primary reinforcer of completing tasks
c) Tokens as a secondary reinforcer, paired with the primary reinforcer of desirable items
d) Grades as a secondary reinforcer, paired with the primary reinforcer of academic achievement