If people spend more time at meals with alcohol, they have more opportunity to eat, which could lead to consuming more food. This provides a potential explanation for the extra 175 calories. Since it contributes to an explanation, (A) is wrong on this EXCEPT question.

Later meals tend to be larger and more likely to include alcohol. This could be why the meals with alcohol tend to involve more calories than meals without alcohol. Since this contributes to an explanation, (B) is wrong on this EXCEPT question.

People eat more when more people are present, and more people tend to be present at meals with alcohol. So the extra calories at meals with alcohol might be driven by the social setting rather than the alcohol. Since this contributes to an explanation, (C) is wrong on this EXCEPT question.

You might think "carefully prepared" and "attractively served" don't directly address how much food people eat. But this isn't a Must Be True question. If the meals served with alcohol tend to be the ones that are most carefully prepared and most attractively presented, it's reasonable to think that could make people more likely to eat more. So the extra calories could be driven by the quality and presentation of the food at meals that have alcohol. Since this contributes to an explanation, (D) is wrong on this EXCEPT question.

This tells us about the composition of calories at meals with alcohol: a higher proportion from carbohydrates, a lower proportion from fats and proteins. But the finding we need to explain is why people consume more total calories from food at meals with alcohol. Knowing that a greater share of those calories comes from carbs and a smaller share from fats and proteins doesn't explain why the total is higher. You could shift the ratio of carbs to fats without changing the total amount of food consumed at all. Since (E) doesn't contribute to an explanation of the difference in caloric intake, it's the correct answer on this EXCEPT question.