Urine Ejection Cannot Occur Unless Which Event(s) Takes Place

Multiple Choice

Urine ejection cannot occur unless which event(s) takes place?

A) Both the internal and external urethral sphincters are contracted.
B) The internal urethral sphincter is relaxed, and the external urethral sphincter is contracted.
C) The internal urethral sphincter is contracted, and the external urethral sphincter is relaxed.
D) Only the internal urethral sphincter is contracted.
E) Both the internal and external urethral sphincters are relaxed.