Discussing the merits of domesticated ducks, Chef A declares that the moulard is the leanest. Chef B counters that Muscovy duck is the leanest. Which chef is correct?

To determine which chef is correct regarding which type of domesticated duck is the leanest, we need to consider the characteristics of the moulard and Muscovy ducks.

Moulard ducks are a hybrid breed, often raised for their meat and known for their rich flavor and substantial fat content. On the other hand, Muscovy ducks are generally leaner than other domesticated duck breeds and are often sought after for their meat because of this lower fat content.

Given this information, we can conclude that Chef B is correct: Muscovy duck is indeed leaner than moulard duck.

Therefore, the answer is:

D) Chef B is correct.