Which Behavior Provides the Best Example of What Happens in a Taste-Reactivity

Which behavior provides the best example of what happens in a taste-reactivity test?

A) The subject is willing to continue pressing the lever for a preferred food despite an ever-increasing response requirement to get the food (e.g., 5 presses, 15 presses, 40 presses) .
B) The subject drinks more sweet-flavored water than plain water.
C) The subject produces disgust responses (e.g., a dog snorts, wrinkles nose, gapes, retches) when exposed to an unpleasant taste and pleasure responses (e.g., sniffing, salivating, licking mouth) when exposed to a pleasant taste.
D) The subject engages in approach responses when exposed to an appetitive outcome and withdrawal responses when exposed to an aversive outcome.