1. Which of the following statements about constantspeed counterweight propellers is also true when referring to two-position counterweight propellers? A. Blade angle changes are accomplished by the use of two forces, one hydraulic and the other centrifugal. B. Since an infinite number of blade angle positions are possible during flight, propeller efficiency is greatly improved. C. The pilot selects the RPM and the propeller changes pitch to maintain the selected RPM.