单项选择题

A.MCV↓、MCH↓、MCHC正常、RDW正常
B.MCV↓、MCH↓、MCHC↓、RDW↑
C.MCV↑、MCH↑、MCHC正常、RDW正常
D.MCV↑、MCH↑、MCHC正常、RDW↑
E.MCV、MCH、MCHC、RDW均正常