Final answer:
Croutons are an appropriate garnish for a puree soup, adding a contrasting texture to the smoothness of the soup. They enhance the presentation and can complement the soup's flavors.
Step-by-step explanation:
An appropriate garnish for a puree soup is A) Croutons. Garnishes are used to enhance the aesthetics and sometimes add a contrasting texture to dishes like soups. Croutons offer a crunchy texture that complements the smoothness of pureed soups. It is essential that the garnish not only looks good but also complements the flavors of the soup. Other garnishes could include a dollop of cream, fresh herbs, or a drizzle of olive oil, depending on the soup's ingredients and flavor profile.