To reduce the cabin rate of climb, which adjustment should be made?

To effectively reduce the cabin rate of climb, closing the outflow valve faster is the appropriate adjustment. The outflow valve plays a critical role in regulating the cabin pressure by controlling the amount of air that is allowed to exit the cabin. When the cabin pressure needs to be maintained or reduced at a slower rate, closing the outflow valve faster prevents excess cabin air from escaping, thereby stabilizing the pressure and reducing the rate at which the cabin altitude is changing.

In this context, closing the outflow valve affects the rate of pressure change directly and is a strategic maneuver to manage cabin altitude effectively during ascent or descent. Proper management of cabin pressure is essential for passenger comfort and safety, particularly at high altitudes.