According to paragraph 2, a symptom of iron deficiency is the presence in young leaves ofA

According to paragraph 2, a symptom of iron deficiency is the presence in young leaves of

A．deep red discoloration between the veins

B．white or yellow tissue between the veins

C．dead spots between the veins

D．characteristic dark green veins

请帮忙给出正确答案和分析，谢谢！