In an Experiment with Rats, a Researcher First Pairs a Light

Multiple Choice

In an experiment with rats, a researcher first pairs a light with a shock for 20 trials, and then pairs a light-and-tone compound with the same shock. When the rats are tested with trials of the tone only, the light only, and the light-tone compound only, the researcher finds that the subjects show fear responses with

A) the light only, the tone only, and the light-tone compound.
B) the light only, but not the tone only or the light-tone compound.
C) the light only and the light-tone compound, but not the tone only.
D) the light-tone compound, but not the tone only or the light only.