This question asks us to complete an analogy, which requires identifying the relationship between the first pair of words and applying that same relationship to the second pair. The first pair is Book: Reading. The relationship here is that a book is an object whose primary purpose or function is reading.
Following this logic, we need to find the primary purpose or function of a Fork. A fork is a utensil primarily designed and used for the act of eating. Therefore, Eating is the correct answer, as it directly corresponds to the primary function of a fork. Options A (Drawing), B (Writing), and D (Cooking) are incorrect because while a fork might be tangentially involved in cooking, or one could theoretically draw with it, none represent its fundamental and primary purpose in the same way reading is to a book.