According to a study published in The New England Journal of Medicine, aspirin prevents blood clots just as well as a commonly used and more expensive blood-thinning drug does.
(A) prevents blood clots just as well as a commonly used and more expensive blood-thinning drug does
(B) prevents blood clots just as well as does a commonly used and a more expensive blood-thinning drug
(C) prevents blood clots just as well as will a commonly used and more expensive blood-thinning drug
(D) works just as well as a commonly used and more expensive blood-thinning drug at the prevention of blood clots
(E) works just as well as does a commonly used blood-thinning drug, which is also more expensive, at preventing blood clots
