One night whilst on patrol, I noticed a strange flickering light coming from a window of a ground floor flat. Close inspection revealed a yellow glow and hot window. It was obviously a fire.
I ran around to the communal entrance door and having already alerted the fire brigade I checked with neighbour and realised that an elderly lady lived in the flat. Still no sign of the fire service so in a time-honored fashion I took an almighty kick at the front door of the flat. Several seconds passed before my hip slipped slowly back into its socket; the door hadn"t moved an inch. I continued kicking at the door finding strength that is only available at times of high adrenalin and finally kicked in the door and frame quickly followed by a considerable quantity of bricks and plaster. The door had in fact stayed locked shut with numerous locks and it was the frame that had failed. Edging along the hallway I was able to shut the door to the living room where the fire had taken complete hold. Flames were seeping out of the living room door and along the hall ceiling and it was obvious that there would have been no hope for anyone who was still remaining in that morn. On investigating the rest of the flat I opened a bedroom door to find the most surreal image I have ever seen. Sat up in bed, teeth in a glass at her side with smoke swirling around her, was an old lady reading a copy of the Times newspaper . Realising that I was there and obviously not recognising me as a police officer (the hat had been discarded long ago) she screamed at me to get out. If I forced her out I"d probably give her a heart attack so I dashed back out of the fiat and donned my hat before re-entering the flat and leading her out,
The story made the local press, but what was never reported was that I was recommended for a commendation. A few weeks later I was seen by a very sheepish looking Chief Inspector from the Complaints and Discipline Department and served with a set of papers (police jargon for the papers served which outline a complaint). The owner of the flat, not the old lady, had made a complaint regarding the damage to the door. Having signed for the receipt of the papers they were quickly consigned to the nearest cabinet. I never did receive any recognition for my actions that night nor was I subjected to any disciplinary action. It had been one of the most frightening but satisfying things I was ever to do as a Police Officer.What can we tell from the "flickering light" ______

A．It was the flashlight made for rescue by the people inside
B．It signaled that there was a big fire out of control
C．It signaled, that the fire inside the house was small
D．There was an explosion near the window that made the light