A food allergy isAthe inability to digest a food Bdisliking a food Can overreaction of the immune system Da reaction to a food additive

A food allergy is C: an overreaction of the immune system.

Here's why:

A food allergy occurs when your immune system mistakenly identifies a specific food or a substance in food as something harmful. Your immune system triggers cells to release antibodies known as Immunoglobulin E (IgE) antibodies to neutralize the allergy-causing food or food substance (the allergen). The next time you eat even the smallest amount of that food, the IgE antibodies sense it and signal your immune system to release a chemical called histamine, as well as other chemicals, into your bloodstream. These chemicals cause a range of allergic reactions.

So, it's not about the inability to digest a food (A), disliking a food (B), or a reaction to a food additive (D). It's about the immune system's overreaction.