Adrenaline Is Responsible for the Body's "Fight or Flight" Response

Adrenaline is responsible for the body's "fight or flight" response. Taking amphetamines results in a similar response. Which of the following statements best explains this observation?

A) Adrenaline and amphetamine are both metabolized in the same way because they have similar structures.
B) Adrenaline and amphetamine both bind to the same receptor because they have similar structures.
C) Amphetamine replaces adrenaline in important biosynthetic pathways.
D) There are two different pathways for the "fight or flight" response. Adrenaline activates one and amphetamine activates the other.
E) No one understands why this occurs.