Maria Has a Nut Allergy and Accidentally Ate Some Pine

Maria has a nut allergy and accidentally ate some pine nuts in her salad while eating at a restaurant. Almost immediately after eating them, Maria went into anaphylactic shock, but fortunately she was quickly treated and completely recovered. What treatment option was the best for Maria and why?

A) a treatment that would have decreased the amount of histamine in her blood so that her blood vessels could constrict and raise her blood pressure
B) a treatment that would have increased the number of cytotoxic T cells in her blood so that they could kill infected cells at a higher rate
C) a treatment that would stimulate antibody production by B cells so that the antibodies could bind to antigens on pathogens more readily