In the last paragraph, "play down their visibility" refers to ______.

A．let your superiors know how good you are
B．work as a consultant to your superiors
C．perform well your tasks given by your superiors
D．project a favourable image to the people around you

A．shippers will be charged test without a rival railroad
B．there will soon be only one Railroad Company nationwide
C．overcharged shippers are unlikely to appeal for rate relief
D．a government board ensures fair play in railway business