Final answer:
Bell peppers are the vegetable commonly found in many paella recipes, contributing flavor and color to this traditional Spanish dish.
Step-by-step explanation:
The vegetable that is often seen in several of the paellas is B) Bell Peppers. Paella is a traditional Spanish dish that has many variations, but bell peppers are commonly included for their flavor and color. While other vegetables and ingredients can be part of a paella, such as green beans, cauliflower, zucchini, celery, and even fruits like tomatoes, bell peppers are frequently favored in this iconic dish.