ANS:B - liquid side coefficient should be increased.

For absorbing a sparingly soluble gas in a liquid: The gas side coefficient should be increased. Increasing the gas side mass transfer coefficient (also known as the gas film coefficient) enhances the rate at which the gas is transferred from the gas phase to the liquid phase. This increase in the gas side coefficient facilitates faster absorption of the sparingly soluble gas into the liquid. The gas film coefficient represents the resistance to mass transfer on the gas side of the interface. By increasing this coefficient, you reduce this resistance, allowing the gas to more readily dissolve into the liquid. Therefore, to improve the absorption of a sparingly soluble gas in a liquid, it is beneficial to increase the gas side coefficient.