Jeff Woke Up with a Headache

Jeff woke up with a headache.He took two orange-flavoured aspirins.When he still had the headache an hour later,he then took two cherry-flavoured aspirins and his headache was gone in 45 minutes.What factor might have been theoretically responsible for alleviating Jeff's headache?

A) The flavouring in the aspirin and the passage of time.
B) The passage of time and the cumulative effect of four aspirin tablets.
C) The cumulative effect of four aspirin tablets
D) The flavouring in the aspirin,the passage of time,and the cumulative effect of four aspirin tablets.