Question

question 2
which of the following is a secondary reinforcer?
a light stroking of the skin
b food
c comfortable air temperature
d money
e a threat

Explanation:

Primary reinforcers satisfy biological needs directly, like food, physical comfort from skin - stroking or comfortable air temperature. A threat is a punisher. Money is a secondary reinforcer as it has no inherent biological value but gains its reinforcing power through association with primary reinforcers (it can be used to obtain food, shelter etc.).

Answer:

D. money