How Do Mast Cell Stabilizers Reduce the Activity of Allergens

How do mast cell stabilizers reduce the activity of allergens?

A) They stabilize mast cells and prevent them from forming allergy-causing antibodies,thus stopping an allergic reaction.
B) They reduce allergy-causing antibodies from forming,thus preventing an allergic reaction.
C) They prevent mast cells from releasing allergy-causing substances,thus inhibiting an allergic reaction.
D) They decrease mast cell degranulation and the release of inflammatory substances,thus reducing the reactivity to allergens.