To solve this problem, we need to analyze each statement about basophils:$\newline \bullet$A. Basophils are the most abundant cells of the total WBCs.$\newline$ - This statement is incorrect. Neutrophils are the most abundant white blood cells, not basophils. Basophils are the least abundant.$\newline \bullet$B. Basophils secrete histamine, serotonin, and heparin.$\newline$ - This statement is correct. Basophils release histamine, serotonin, and heparin, which are involved in inflammatory responses.$\newline \bullet$C. Basophils are involved in inflammatory response.