Which of the Following Cannot Be Explained Well Without R-O

Multiple Choice

Which of the following cannot be explained well without R-O mechanisms?

A) A rat decreases lever-pressing for food when presented with a CS for footshock, but increases pressing when a CS signaling access to food is presented.
B) A rat decreases rod-pushing for food when presented with a CS that signals the end of access to food, but increases pushing when a CS signaling access to sugar water is presented.
C) A rat decreases licking a grape-flavored solution after that solution was paired with illness, but continues to lick a strawberry-flavored solution.
D) A rat decreases pushing a bar to the right for food after that food was paired with illness, but continues to push the bar to the left for water.