Leukocytes, ordered from least to most abundant, are the:
basophils, eosinophils, monocytes, lymphocytes, and neutrophils
neutrophils, lymphocytes, monocytes, eosinophils, and basophils
neutrophils, monocytes, eosinophils, basophils, and lymphocytes
basophils, eosinophils, lymphocytes, monocytes, and neutrophils