Which of the following is not one of the four main laws for kosher foods?

The correct response indicates that consuming blood is not permitted under kosher dietary laws. In fact, one of the fundamental principles of kashrut — the Jewish dietary laws — explicitly prohibits the consumption of blood from animals. This prohibition stems from biblical directives emphasizing the sanctity of blood, which is considered the life force of the animal.

Conversely, the other options reflect established components of kosher principles. For instance, permitting certain birds and animals is part of the laws that define which species are deemed kosher. The restrictions on certain grains during Passover are also a vital element of Passover dietary laws, where chametz (leavened products) must be avoided. Additionally, the complete separation of milk and meat is a critical aspect of dietary observance that defines a kosher kitchen, supporting the notion that these two food types must not be cooked, served, or consumed together.

Thus, the choice that suggests consuming blood is permissible contradicts a core tenet of kashrut.