The correct answer is D) decrease the starting current and decrease the starting torque. When the voltage applied to an AC induction motor is reduced during the starting period, it leads to a decrease in the starting current and a corresponding decrease in the starting torque. This is because the starting torque of an induction motor is proportional to the square of the applied voltage. Reducing the voltage, therefore, reduces the starting torque, which can make it more difficult for the motor to overcome its initial load and start up smoothly. The other options are incorrect because: A) Reducing the voltage would decrease the starting current, not increase it. B) Reducing the voltage would decrease the starting torque, not increase it. C) Reducing the voltage would decrease both the starting current and the starting torque.