GWD3-Q19 语法疑问

GWD3-Q19:

Possible long-term consequences of the “greenhouse effect,” the gradual warming of the Earth’s climate, may include melting the polar ice caps and a rising sea level.             E  ?

1. may include melting the polar ice caps and a rising sea level

2. may include the melting of polar ice caps and the rising sea level

3. may include polar ice caps that are melting and sea levels that are rising

4. include melting the polar ice caps and sea levels that are rising

5. include melting of the polar ice caps and a rise in sea level

这道题正确答案是E，但是我选的是C，我觉得不对称！Melting of 什么词性？

因為POSSIBLE與MAY 意思相近 犯了REDUNDACY