What kind of seafood is featured in the Cioppino?

The answer highlights that the Cioppino is traditionally a seafood stew that incorporates a variety of shellfish and fish, which aligns with the typical preparation of this dish. The inclusion of mixed seafood, such as fish, shrimp, and mussels, is a hallmark of Cioppino, making it flavorful and diverse. This mixture maximizes the variety of textures and flavors in the stew, characteristic of the dish's Italian-American roots, often reflecting the activity of seaside fishermen.

The other choices suggest specific types of seafood that do not represent the classic Cioppino blend. For instance, salmon and crab, tuna and clams, or sole and lobster do not encompass the traditional, varied seafood selection that makes Cioppino so vibrant and complex. This is likely why the focus is on a mixture of seafood rather than specific individual types in the correct answer.