What is the indication shown that allows a train to proceed on a diverging route?

A train is allowed to proceed on a diverging route when it receives a clear indication specifically signaling that it can enter this alternate path. The indication for proceeding on a diverging route is crucial as it ensures safe navigation through switches and points where the track diverts from the main line.

When the indication is given for the diverging route, it means that the train is cleared to travel safely onto that alternate track, which is typically set up at a lower speed than the main line. This is important for the safety of both the train and any potential conflicting movements on that route.

In contrast, other options imply either a stop condition or a direction that does not pertain to the diverging route signal, which would not allow safe movement onto that path. Therefore, option C accurately reflects the condition under which a train can safely proceed onto a diverging route.