Because women buy approximately 80 percent of ties sold in the United States,
they are often displayed near perfume or women’s clothing departments.
A. they are often displayed
--> Incorrect: The subject of original sentence is 'women' and hence, grammatically it the pronoun 'they' should reference 'women'. However, logically 'women' are not displayed in clothing departments and we need a clear identifier for 'ties'.
B. ties are often being displayed
--> Incorrect: 'being displayed' is a sentence structure that indicates ongoing activity. But, the given sentence is a mere factual statement which does not need this structure.
C. the displaying of ties is often
--> Incorrect: 'displaying of ties' is a participial form which is not required by the sentence.
D. ties are often displayed
--> Correct. This is clear and logical.E. they often can be found
--> Incorrect: for same reason as A.