Which two products should be portioned using a solid spoon?

The correct choice highlights the appropriate use of a solid spoon for portioning specific food items that have consistency or texture suited for that tool. Mashed potatoes are typically thick and require a solid spoon for effective serving, allowing for control over portion size and minimizing waste. Raspberry compote, while it may have a looser consistency than mashed potatoes, is still thick enough to benefit from the use of a solid spoon. This combination of items makes it ideal for use with a solid utensil.

In contrast, the other options involve mixtures or items that would not be effectively served with a solid spoon. For example, whipped cream is lighter and fluffier, making it more suitable for a different serving utensil. Similarly, salad and dressing could require a more delicate handling to ensure even coating and avoid wilting the greens, while gravy and soup, being liquid, would typically need ladles or other tools specifically designed for liquids. Thus, the focus on the texture and consistency of the items solidifies B as the most appropriate answer.