Choose the Answer Which Best Rewords the Italicized Portion

Choose the answer which best rewords the italicized portion. If you think the original wording is best, choose option A.
Although water covers approximately sixty-seven percent of the Earth's surface, less than three percent is fresh water.

A) Earth's surface, less than three percent
B) Earth's surface; less than three percent
C) Earth's surface: less than three percent
D) Earth's surface. Less than three percent