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.
Accounting for fresh water locked in glaciers, icecaps, or otherwise inaccessible, the water humans have is less than a tenth of a percent of the Earth's water available for human consumption.

A) the water humans have is less than a tenth of a percent of the Earth's water available for human consumption.
B) less than a tenth of a percent of the Earth's water, is available for human consumption.
C) humans can only consume less than a tenth of a percent of the Earth's water.
D) the amount of water available for human consumption is less than a tenth of a percent.