(A) may explain that most scientists have obscured the health benefits of wine, but this isn’t the main point of the passage as a whole. Instead, the main point that we’re looking for is that the health benefits of wine may come from grapes.

Also, (A) says that scientists have studied the beverages in ways that have obscured “their” healthful effects. However, the passage only says that wine has healthful effects––nothing in the passage suggests that beer or spirits are healthy.

The main point isn’t to debunk beliefs about the causes of premature heart disease. Instead, the main point of the passage is to show that wine, unlike other forms of alcohol, has health benefits, and these health benefits may come from grapes. In fact, the author says that researchers have been finding additional contributing factors of premature heart disease for the past 20 years, so we can’t support the claim a new study questioned the belief that premature heart disease is solely caused by high lipid levels.

This is stated in the passage, but this is not the main point. The main point that we’re looking for is that the health benefits of wine may come from grapes; the statement in (C) just serves to show one way that wine consumption has effects that are different from other forms of alcohol.

The main point isn’t that the health benefits of wine haven’t been proven definitively. The studies mentioned in P3 seem to show that wine does have health benefits. The author’s main point isn’t to cast doubt on these findings. Instead, the author’s main point is to suggest that grapes may be causing the health benefits of wine.