A. Most of the over-the-counter medications marketed for the relief of sinus headache are equally effective per dose in providing such relief.
WRONG:- It says all one tablet of all drug will remove headache, so based on the second premise which says SineEASE is the cheapest per capsule actually makes this option a STRENGTHENER.

B. Many of the over-the-counter medications marketed for the relief of sinus headache contain the same active ingredient as SinEase does.
WRONG:- Says the same thing but this time in term of chemical composition of the drug rather than the dosage. This means all drug use same chemicals and among all these drugs SineEASE is the cheapest. THIS is again a STRENGTHENER.

C. People who suffer from frequent sinus headaches are strongly advised to consult a doctor before taking any over-the-counter medications.
WRONG :- Good advise but totally out of scope. Just ask yourself how is this weakening that SineEASE is the best option.

D. An over-the-counter medication that is marketed for the relief of symptoms of head cold is identical in composition to SinEase but costs less per dose.
CORRECT:- Well, kind of dicey because it talks about "HEAD COLD" and our argument is headache. But this is the one of the only two remaining option and this one talks about that this drug is even cheaper than SineEASE. So Keep it .. DONT DISCARD IT.

E. The per dose price for any given over-the-counter medication marketed for the relief of sinus headache is higher for smaller packages than it is for larger packages.
WRONG:- This is again irrelevant. All this tells us that all 100 mg tablet pack is relatively expensive than 200 mg tablet pack. Does not address our conclusion as to how SineEASE is the best buy