A cup of coffee usually ___________ drowsiness and keeps one awake.IncredibleUntrustworthyFickleTraitorous Credible

The best answer to fill in the blank is "Incredible."

Explanation:

• "Incredible" refers to something that is hard to believe or extraordinary. In the context of coffee, it suggests that it has the remarkable ability to combat drowsiness and keep one awake.
• The other options do not fit the context:
  • "Untrustworthy" implies that something can't be relied upon, which doesn’t relate directly to coffee.
  • "Fickle" means changeable or inconsistent, which is not relevant here.
  • "Traitorous" implies betrayal, which doesn’t suitably describe coffee.
  • "Credible" means believable, which doesn't fit as coffee's effect is well-known and typical.

Therefore, the correct option that best completes the sentence is "Incredible."