问题详情

According to Study 3, as distance from the urban site increased, the annual wet deposition:
A.increased for both Cu2+ and Zn2+.
B.increased for Cu2+ but decreased for Zn2+.
C.decreased for both Cu2+ and Zn2+.
D.remained the same for both Cu2+ and Zn2+.请帮忙给出正确答案和分析，谢谢！