Todd Started Drinking Caffeinated Coffee Every Night to Stay Awake

Todd started drinking caffeinated coffee every night to stay awake to study for finals. On Sunday evening, Todd was able to stay awake after drinking one cup of coffee. By Thursday evening, Todd found that he needed to drink two cups of coffee to get the same effect. Why is this so?

A) Todd must have used caffeine in combination with a second drug on Sunday evening.
B) One of the two cups on Thursday night must have been a placebo.
C) Todd has developed a tolerance to low doses of caffeine.
D) Todd has become dependent on caffeine.

Correct Answer:

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