The Following List Is a List of Facts

The following list is a list of facts.
1.permafrost in the arctic is melting
2.Greenland and Antarctic ice sheets are losing mass.
3.the area covered by the Arctic sea ice is getting smaller.
4.sea level has risen.
A logical conclusion is that

A) carbon dioxide is increasing.
B) the climate is getting warmer.
C) the oceans are getting more acid.
D) these facts are not related.