i find it in about 1.10 the time to read all the question.
So, I think in somehow you overcalculate sometimes and I see this through your post.
Think in this way.
We have the passage, and you must tackle the Cr (or almost this kind) so:
Two genes BRCA1 and BRCA2 are linked to hereditary breast cancer - PREMISE
Therefore in
order to decrease the annual number of mammogram tests administered across a population and to more accurately assess a woman's individual risk of breast cancer,
all women should be tested for these genes - CONCLUSION
But in this latter trying to go to the core of the question and eliminate the verbose part that put you in the wrong way or confuse you. In this case you read only the part in bold
After this I do in that way: I read A and if cuold be good i hold it, if does not have nothing or add unuseful information...delete. without doubt.
I read B and so on.......in this way you have for sure 2 or at most 3 choice and so you can pick between these.
NOW: in this case thanks to the premise that says us: who have this 2 kind of genes could have breast cancer --------> all women should be tested for these genes.
Here I see more clear that the only bridge that binds the two things is ONLY who has this markers - in medical meaning - has more risk to became a sick person, so make a mammogram e bla bla bla..........
To sum up, who has this genes should do the mammogram because have an high risk to fall ill.......who not could help to reduce the cost binds with the use and/or abuse of mammogram and weigh on health sector
indeed the correct answer is D