Question

what evidence from the video indicates that the rats, like humans, find nicotine to be a weak reinforcer?
oa. the rats press the lever least when cocaine is presented.
ob. the rats work much harder after ingesting nicotine.
oc. the rats press the lever more often to ingest nicotine.
od. the rats would rather work for drugs other than nicotine.

Explanation:

If rats would rather work for drugs other than nicotine, it implies that nicotine is a weak reinforcer for them as they prefer other substances. Option a shows preference for cocaine over something else, not about nicotine being weak. Option b about working harder after ingesting nicotine doesn't imply weakness as a reinforcer. Option c shows preference for nicotine, contrary to it being a weak reinforcer.

Answer:

D. The rats would rather work for drugs other than nicotine.