Bill Always Starts His Day with a Cup of Strong

Multiple Choice

Bill always starts his day with a cup of strong coffee. Bill stayed overnight at his mother's home, and she made him a cup of coffee when he got up. Later, he was surprised to discover that his mother's coffee was decaffeinated, because he had felt more alert after drinking the coffee. In this example, what are the CS and CR?

A) The CS is the drug caffeine, and the CR is alertness.
B) The CS is the smell and taste of coffee, and the CR is the drug caffeine.
C) The CS is alertness, and the CR is the smell and taste of coffee.
D) The CS is the smell and taste of coffee, and the CR is alertness.