What Is Most Likely to Be the Intended Connecting Term

Multiple Choice

What is most likely to be the intended connecting term in the following argument by analogy? Since coffee keeps me awake, black tea will keep me awake.

A) They both contain caffeine.
B) They are both drinks.
C) They can both be made in a microwave oven.
D) They are both stirred with a spoon.
E) They are both served hot.