When the input optical power of the OAU amplifier at the receiving end is lower than the nominal optical power, the following operations which is wrong?

When the input optical power of the OAU amplifier at the receiving end is lower than the nominal optical power, the following operations which is wrong?
A . Adjust the adjustable optical attenuation before the receiving amplifier to increase the input optical power of the amplifier
B . Set OAU gain so that its output reaches the nominal value
C . Increase the transmit optical power of the transmitter
D . When the input optical power cannot be increased by adjusting the adjustable attenuator, the adjustable attenuation at the input of the de-suppression amplifier

Answer: C