What control input produces the highest amount of pitch attitude and the slowest rotation rate in an erect spin?

The correct choice is full aft stick, as this control input causes the aircraft to pitch up significantly while entering an erect spin, leading to a higher pitch attitude. In a spin, the airplane is already in a stalled state, and pulling the stick aft further increases the angle of attack, which contributes to a more pronounced pitch attitude.

In addition, applying full aft stick during an erect spin tends to slow down the rotation rate. This happens because the increased angle of attack creates a more pronounced stalled condition, which reduces the effectiveness of the ailerons and rudder to provide sufficient control authority to generate rapid rotations. Consequently, the aircraft will experience a slower rotation rate compared to other control inputs like neutral or forward stick, which do not enhance the pitch attitude as effectively or may increase the rotation rate due to their influence on lateral control and aerodynamic forces at play during the spin.

Understanding the dynamics involved in spins is essential for safely managing aircraft behavior and recovery procedures, and recognizing how control inputs affect pitch attitude and rotation rate aids pilots in making informed decisions during flight.