The correct answer is: A. Run through from station
A distant signal is a railway signal that is placed at a distance from a main signal to warn approaching trains of the presence of the main signal and to indicate whether the main signal is at danger or clear. A distant signal that shows green accepts means that the main signal is at clear and that the train may proceed through the station.
Option B is incorrect because a receive of main line indication means that the train is to receive on the main line. This is not possible if the distant signal is showing green accepts, as this indicates that the main signal is at clear.
Option C is incorrect because a receive on loop line indication means that the train is to receive on the loop line. This is not possible if the distant signal is showing green accepts, as this indicates that the main signal is at clear.
Option D is incorrect because it is not a valid option.