Access to potable water is most heavily limited by money.
The correct option is A, money.
What is potable water?
Potable water is the water that is safe for drinking purposes.
Water is very necessary for life, and clean and potable water is also important for good health.
Every person is not able to get clean water.
Poor people can not afford to get water all the time.
Thus, the correct option is A.
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