Holly Was Dancing with Her New Boyfriend at an Elvis

Holly was dancing with her new boyfriend at an Elvis tribute. When the band started playing, "Can't Help Falling in Love with You," her boyfriend gave her a long, passionate kiss, which Holly found very enjoyable. Now Holly finds that every time she hears "Can't Help Falling in Love with You" on the radio, she becomes a little flushed. In this example, the conditioned stimulus is the

A) long, passionate kiss.
B) song, "Can't Help Falling in Love with You."
C) enjoyment she experienced after the kiss from her boyfriend.
D) flushing she experiences when she hears the song on the radio.