On Tuesday Morning, Patience Prepared Her Typical Breakfast of Cornflakes

On Tuesday morning, Patience prepared her typical breakfast of cornflakes with milk and a cup of coffee. However, instead of having guava with her breakfast, she tried eating grapefruit for the first time. Later she became extremely ill. If her illness causes her to develop a conditioned response to one of her breakfast items, the conditioned response will MOST likely be to

A) grapefruit, because it was a novel stimulus.
B) milk, because the milk may have been sour.
C) guava, because that was the one thing missing from her typical breakfast.
D) coffee, because coffee is a stimulant.