What percent of all of the earth's water is readily available as potential drinking water?

The best choice regarding the percentage of all of the earth's water that is readily available as potential drinking water is indeed 0.34%. This figure represents the proportion of freshwater that is easily accessible for human use, which includes surface water found in lakes, rivers, and reservoirs, as well as groundwater in aquifers.

Most of the Earth's water is saltwater, found in oceans, and about 97% of the water on Earth is not suitable for drinking. Of the remaining freshwater, a significant portion is trapped in glaciers and ice caps, which are not directly accessible for consumption. The 0.34% figure helps highlight the limited supply of potable water available for human populations, emphasizing the importance of conservation and sustainable management of freshwater resources.

Other percentages presented in the choices are either too high or do not accurately represent the available freshwater reserves, making 0.34% the correct and relevant statistic in this context.