Which food would be categorized highest in fat among the following options?

Whole milk is categorized highest in fat among the options provided because it contains the full amount of milk fat, which typically is around 3.25% to 3.5% by weight. This fat content gives whole milk its creaminess and rich flavor, making it distinctly higher in fat compared to the other choices listed.

Skim milk, as the name suggests, has had most of its fat removed, resulting in a very low fat content, usually less than 0.5%. 2% reduced-fat milk contains about 2% fat, which is less than whole milk but higher than skim. Nonfat yogurt also has had its fat removed, making it similarly low in fat content like skim milk. These options are all lower in fat compared to whole milk, which retains the natural fat content found in cow's milk. Therefore, whole milk stands out as the highest in fat among the choices.