Hello, please explain why the answer is Option B?

Option B: Western diets result in higher blood cholesterol levels than do non–Western diets.

The argument tells us that higher cholesterol likely provides protection from hemorrhages. From this, the author concludes that western diets offer more protection against hemorrhage. Theres a critical missing element: we don't know that western diets actually have more cholesterol. The author has clearly assumed they do, the argument makes no sense if this is not the case. Thus, b is correct, the author must agree with b.