You woke up this morning with a headache from staying up cramming last night, so you took an aspirin. This should

A) make the headache worse because aspirin increases the production of endorphins.
B) help because aspirin blocks the production of endorphins.
C) help because aspirin stimulates the production of prostaglandins.
D) help because aspirin increases neurotransmitter levels.
E) help because aspirin inhibits prostaglandin synthesis.