Please help, I am having trouble understanding why A is wrong. We know that dietary changes --affect--> high cholesterol ---correlates / causes ---> heart disease, and we know that dietary changes don't affect lipoprotein(a). So the fact that the argument fails to consider the possibility that lipoprotein(a) raises cholesterol levels seems like a flaw to me because we can't conclude there is no reason for people to make dietary changes for preventing heart disease.
This is my line of reasoning: if lipoprotein(a) raises cholesterol level, which is affected by dietary changes, then we can't conclude "there is no reason to make dietary changes for preventing heart disease" because we know dietary changes affect cholesterol level which in turn is correlated with heart disease. Basically, if lipoprotein raises cholesterol levels, then people might want to change their diet and stop consuming foods that contain lipoprotein. I watched the explanation video many times, and I still don't understand why A is irrelevant.
Any help would be appreciated, thank you!!
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