-You Just Finished Watching a Scary Movie and Decide to Take

-You just finished watching a scary movie and decide to take the trash out before going to bed. Halfway down the driveway, the streetlight goes out and something rattles the trashcans, just like in the movie before the monster attacked. Suddenly, the neighbor's cat jumps up onto the top of the trashcan and you shriek. Your increased heart rate is in response to the neurotransmitter

A) glutamate.
B) GABA.
C) oxytocin.
D) acetylcholine.
E) norepinephrine.