Answer:
The activity of blood cells that can be counteracted by an antihistamine is the release of histamine by basophils (option D).
Step-by-step explanation:
Histamine is an inflammatory mediator produced and released by the body in response to an allergic or hypersensitivity reaction. This substance is produced by the mast cell, a basophilic leukocyte that participates in the immune response.
When a person produces an allergic reaction, such as from a bee sting, the presence of the bee venom causes the mast cells to release the histamine they contain, producing capillary vasodilation and the signs of inflammation.
Anti-histamines are a type of medication that prevent mast cells from releasing histamine.
The other options are not correct because cells like erythrocytes, neutrophils or lymphocytes do not contain histamine.