Shelley Drinks Two Caffeinated Grande Lattes Every Morning

Shelley drinks two caffeinated grande lattes every morning. In terms of neurotransmission, what is happening in Shelley's body?

A) Caffeine in the coffee serves as an agonist that suppresses the actions of glutamate and enhances the actions of dopamine.
B) Caffeine in the coffee serves as an agonist that suppresses the actions of dopamine.
C) Caffeine in the coffee serves as an antagonist that enhances the actions of glutamate.
D) Caffeine in the coffee serves as an agonist that increases the availability of glutamate.
E) Caffeine in the coffee serves as an antagonist that suppresses the actions of dopamine.