While in the Restroom, Deanna Hears Her Friend Jenna Throwing

While in the restroom, Deanna hears her friend Jenna throwing up and assumes that Jenna has food poisoning from something she ate at lunch, while a stranger in the restroom assumes that Jenna is bulimic. Regarding Jenna's behavior,

A) both Deanna and the stranger attributed it to internal causes.
B) both Deanna and the stranger attributed it to external causes.
C) Deanna attributed it to an internal cause and the stranger to an external cause.
D) Deanna attributed it to an external cause and the stranger to an internal cause.