The skull of the sentence:
Aspirin prevents X just as well as Blood Thinning drug does.
C, D, and E can be easily eliminated.
Now what is the problem in B?
two issues with the option B.
1. Article:
An X and A Y ---> means two things are talked.
a commonly used anda more expensive blood-thinning drug---> It means there are two drugs--one of them is commonly used and other one is more expensive. This is not case here. We are talking about one drug.
2. A noun without modifier
...
Aspirin prevents X just as well as Blood Thinning drug does.
C, D, and E can be easily eliminated.
Now what is the problem in B?
two issues with the option B.
1. Article:
An X and A Y ---> means two things are talked.
a commonly used anda more expensive blood-thinning drug---> It means there are two drugs--one of them is commonly used and other one is more expensive. This is not case here. We are talking about one drug.
2. A noun without modifier
...







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