Black ____ is graded according to the shape and size of its leaves.

The correct answer is based on the classification of tea, which is graded primarily on the shape and size of its leaves. Black tea undergoes a specific oxidation process and is categorized into different grades according to the appearance of the tea leaves. The grading system takes into consideration characteristics such as the size and shape of the leaves, as well as the quality of the leaves used in the production. For example, certain grades of black tea, like “BOP” (Broken Orange Pekoe) or “FBOP” (Flowery Broken Orange Pekoe), indicate different leaf sizes and qualities.

In contrast, coffee is typically graded based on factors like aroma, flavor, acidity, and body rather than leaf size. Pepper is categorized based on the color and maturity of its berries, while chocolate is assessed mainly on flavor and texture rather than the shape and size of cocoa beans. Therefore, the focus on leaf grading clearly sets black tea apart in this context.