63 LR Two Question 24
- « 63 LR Two Question 23
- 2115 of 3815
- 63 LR Two Question 25 »
Comments
The argument said that Vitamin D deficiency causes Vitamin C deficiency which causes high blood pressure. But we don't know that solving both of those deficiencies can lower blood pressure. I chose (D) because it, in my opinion, closely resembled the argument that without deficiency there won't be high blood pressure. Plus we don't know anything about absorbing the calcium.
I'm with you!
Just because the deficiency (in calcium, not Vitamin C, btw) causes a rise in blood pressure does not mean that restoring Vitamin D will reduce blood pressure (in much the same way that falling may break your arm, but standing up doesn't mean your arm will un-break!).
In this way, I think we have a very, very, very rare example of a poorly-written question (if it had only said "most strongly supported" instead of "properly drawn", I'd feel fine about the whole thing).
That valid protest notwithstanding, we must choose the best of the answers in front of us.
As you've pointed out, (A) doesn't really prove the conclusion. But it does prove that milk is effective in restoring Vitamin D and calcium levels.
This is where (D) fails—it doesn't tell us anything about the people we're arguing about. It would be like this argument:
People who exercise are able to attract mates. Thus, some people who skateboard will be able to find a mate.
And then an answer saying:
People who get their heart rates high achieve all the benefits of exercise.
What's that got to do with skateboarding?
Similarly, what's (D) got to do with our old people and their milk? The answer, of course, is nothing.
Okay, looking back at my work, I have no idea why I chose C when first doing this question - it was my third L.R. section in a row so maybe I was just tired. But what makes me REALLY not like A is the "any other substances" - is that not out of scope? I feel like it's little language things like that that have made answers to other questions wrong on countless occasions.
Sure it's more than we need to know.
But in this Sufficient Assumption question, we haven't been asked for what we need to know; this is a good example of why it's useful to understand what the question is asking you!