Final answer:
The croutons in the caesar salad are made from sourdough bread.
Step-by-step explanation:
The croutons in the caesar salad are special because they are made from sourdough bread, which gives them a unique texture and flavor. They are typically toasted or fried to add crunchiness to the salad. So, option b) They are made from sourdough bread is correct.
Croutons in a Caesar salad are typically made from cubes of toasted or fried bread, and sourdough bread is a popular choice for its tangy flavor and sturdy texture. While other variations of croutons may be infused with garlic butter, cooked in bacon fat, or seasoned with a special blend of spices, the characteristic that makes Caesar salad croutons special is often the use of sourdough bread.