The answer is: A. Permissive.
A distant signal is a permissive signal. This means that it allows a train to proceed to the next signal, but only if the next signal is clear. If the next signal is not clear, the train must stop at the distant signal.
A home signal is a stop signal. This means that a train must stop at the home signal before proceeding.
A subsidiary signal is a signal that is used to supplement a main signal. For example, a subsidiary signal may be used to indicate that a train can proceed to the next signal at a reduced speed.
None of these options is correct.