Which of the following statements are correct?A. Basophils are most abundant cells of the total WBCs.B. Basophils secrete histamine, serotonin and heparin.C. Basophils are involved in inflammatory response.D. Basophils have kidney shaped nucleus.E. Basophils are agranulocytes.

A is incorrect: Neutrophils are most abundant ($60-65\%$).B is correct: Basophils secrete these inflammatory mediators.C is correct: They play a key role in inflammation and allergic reactions.D is incorrect: Monocytes have kidney-shaped nuclei; Basophils have S-shaped or lobed nuclei.E is incorrect: Basophils are granulocytes.Only B and C are correct.