How much pressure is required to push a column of water up 2.3 feet?

To determine how much pressure is required to push a column of water up 2.3 feet, we can use the principle that 1 psi of pressure can support a column of water approximately 2.31 feet high. This relationship stems from the weight of water and the characteristics of pressure.

Given that we need to lift water exactly 2.3 feet, the calculation shows that a pressure of 1 psi is just enough to support that height. Specifically, when considering the approximate elevation that 1 psi can provide, 2.3 feet is effectively just under the limit of what 1 psi can achieve, making it sufficient for this scenario.

The other options suggest higher pressures than necessary. Since 1 psi is adequate to raise water to a height of 2.3 feet, anything above that represents an excess that isn't needed for the specified height. Therefore, the correct choice reflects the minimal pressure required to achieve the desired water column elevation effectively and efficiently.