The correct answer is: C. T-369(3B) with P. NO. of line clear.
T/C 1425 is a type of circuit breaker, while T/D 602 and T-511 are types of transformers. None of these devices are used to control block instruments or advanced starters.
T-369(3B) is a type of relay that is used to control block instruments and advanced starters. It is connected to the line clear signal, which is a signal that is sent when the line is clear to proceed. When the line clear signal is received, the T-369(3B) relay will energize and send a signal to the block instrument and advanced starter, which will allow the train to proceed.
If the block instrument and advanced starter are failed after line clear, it is likely that the T-369(3B) relay is not receiving the line clear signal. This could be due to a problem with the line clear signal itself, or it could be due to a problem with the T-369(3B) relay. To troubleshoot this problem, you would need to check the line clear signal and the T-369(3B) relay.