Elderly women who have suffered heart attacks are five times more like

trying elimination:

Elderly women who have suffered heart attacks are five times more likely to develop dementia than are other elderly women. Therefore, steps taken to prevent heart attacks, such as dieting, may also prevent dementia. Other studies have shown vision loss to be more common among elderly women who have suffered heart attacks. Thus, demented elderly women are much more likely to suffer from vision loss than are other elderly women.

The statement highlighted in boldface plays which of the following roles in the argument?

A)It is an assumption made by the author in constructing the argument: assumptions bridge evidence to conclusion... here... the statement looks is a conclusion or inference (since it is followed by therefore)
B)It contradicts part of the author's conclusion. immediately eliminated
C)It is the main conclusion to which the author is proceeding. cant say because this para seems to dealing with 2 diff.. the sequence and tone dsnt suggest that this conclusion is based on the information that all the other statements provide.
D)It acts as the principal piece of evidence for the conclusion that the author draws. The statement follows from the info provided in the first statemnt. it is not evidence for sure (it dsnt support anything)
E)It is a conclusion drawn by the author but not relevant to the main point: this is a googly.. this is exactly opposite of point C... However, the edge here is that the second conclusion comes from "other" studies as well as the premise. hence it supports the thought that the first one could be ancilliary conclusion but not the main

E looks correct