单项选择题

A.MCV正常、MCH正常、MCHC正常
B.MCV增高、MCH增高、MCHC正常
C.MCV增高、MCH正常、MCHC正常
D.MCV减低、MCH正常、MCHC正常
E.MCV减低、MCH减低、MCHC减低