Choose the Answer Which Best Rewords the Italicized Portion

Multiple Choice

Choose the answer which best rewords the italicized portion. If you think the original wording is best, choose option A.
If two or more nations which disagree on water rights or building projects, conflicts can emerge.

A) If two or more nations which disagree
B) If two or more nations, which disagree
C) If two or more nations disagree
D) If two or more nations that disagree