There is a torque converter that automatically changes the torque needed.
The purpose of the clutch is to disconnect the engine from the drive shaft so that the driver can manually change gears or change the torque. A clutch would be useless in an automatic car.
B The clutch is already built into the accelerator.
C The clutch is solely to change gears from 1-5. Automatic cars only use the D or drive gear.
D The clutch is responsible for the turning of the wheels but in automatic transmissions, it is replaced by the universal joint.