【请教】GWD-2-Q40:

Q19:GWD-2-Q40:          

Which of the following most logically completes the argument?

A new drug, taken twice daily for one month, is an effective treatment for a certain disease.  The drug now most commonly prescribed for the disease occasionally has serious side effects such as seizures; in field tests, the new drug’s side effects, though no worse than mild nausea, turned out to be much more frequent.  Nevertheless, the new drug is clearly preferable as a treatment, since _____.

A.    people who experience nausea are prone to discontinue use of the new drug prematurely

E.there is a nonprescription medication that when taken with the new drug prevents the onset of nausea （没有其他药跟新药一起服用来阻止nausea的出现，但原文讨论的是只服用新药，所以该解释跟原文结论无关？？？）

请各位大虾指教！！！

谢谢！！！