Explanation:

The word that names a necessary part of the underlined word "Recipe" is "Directions".

- A recipe is a set of instructions or directions on how to prepare a particular dish or meal.
- Directions provide step-by-step guidance on how to combine ingredients and perform various cooking techniques to create the desired dish.
- Without directions, one would not know the specific actions and order in which to perform them to successfully prepare the dish according to the recipe.

Example:
Let's say we have a recipe for making chocolate chip cookies. The recipe may include a list of ingredients such as flour, sugar, butter, chocolate chips, etc. However, without the directions, one would not know how to combine these ingredients, what temperature to bake the cookies at, and for how long.

Other options:
- Desserts: While desserts are often made using recipes, they are not a necessary part of the recipe itself. Desserts are a category of dishes that include sweet treats, but not all recipes are for desserts.
- Cookbook: A cookbook is a collection of recipes, but it is not a necessary part of an individual recipe. A cookbook is a resource that contains multiple recipes, but a recipe can exist independently without being a part of a cookbook.
- Utensils: Utensils refer to the tools or equipment used in cooking, such as knives, spoons, pots, pans, etc. While utensils are often used in the process of following a recipe, they are not a necessary part of the recipe itself. One can have a recipe without any mention of the utensils required to prepare the dish.

Therefore, the correct answer is option B) Directions, as they are a necessary part of a recipe.