Mountain14 wrote:

I have a question between B and C....

b) Were the two groups of people in the study involved in the same exercise program?

--- As per OE, this is Alternative consideration making this Choice Correct....

c) Can the same drop in cholesterol be achieved through medication?

---- Why can't medication also be the alternate choice to consider? If medication can drop the chlr level then this choice should also be considered?

Pls suggest...

First of all, the conclusion is: “eating whole grains can have an appreciable effect on cholesterol levels”.

C: Can the same drop in cholesterol be achieved through medication?If two groups take the same medication, and they have the same drop in cholesterol -->

FINAL RESULTS are the same, we cannot determine whether whole grains help to reduce cholesterol or not.

For example:A and B have same cholesterol levels at 10

After eating whole grains ==> A’s cholesterol reduces to 5

B did not eat whole grains ==> B’s cholesterol is still 10

BUT, after taking medication ==> Both A’s cholesterol and B’s reduce to 3. You don’t know whether whole grains helped A? but actually, whole grains did.

KEY word is “THE SAME DROP” ==> The FINAL results the same . It doesn’t matter how A and B did, the final results are the same.

But "eating whole grains" is middle factor ==> Hence, C cannot help to evaluate the middle factor.

B: Were the two groups of people in the study involved in the same exercise program?. KEY WORD “same exercise” ==> Exercise has same effects on A and B. If A and B take different exercises ==> The final results may be different

For example:A and B have same cholesterol levels at 10

After eating whole grains ==> A’s cholesterol reduces to 5

After exercising ==> A’s cholesterol

reduces 3 more

==> Total cholesterol reduction of A is 8

B did not eat whole grains ==> B’s cholesterol is still 10

After exercising ==> B’s cholesterol

reduces 3 ==> Total cholesterol reduction of B: 3

Clearly, B helps you evaluate the effect "reduction 5 points of whole grains".

Hope it's clear

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