One of the advantages of gas-operated double-acting piston pumps is that:

Gas-operated double-acting piston pumps are particularly advantageous in situations where pumping to significant depths is required. This design allows for the efficient movement of fluids from deep underground sources, making it suitable for wells or applications that necessitate lifting water or other liquids from considerable depths. The double-acting mechanism, which utilizes pressure on both the up and down strokes of the piston, enhances the efficiency and force exerted, enabling the pump to generate the necessary pressure to lift fluids from greater depths than other simpler pump designs.

The other options highlight characteristics that may not fully represent the specific advantages of gas-operated double-acting piston pumps in comparison to their actual capacities. For instance, while portability can be a feature of some pumps, it is not a distinguishing advantage of this particular type, and they might not be the most cost-effective choice available. Furthermore, aeration of samples is generally not desirable when extracting liquids from wells, as it can affect the quality and integrity of the sample being collected. Thus, the capability to pump efficiently to great depths stands out as the primary advantage of these pumps in practical situations.