A is the Trident II.
I've learnt that a good indicator is the nose probe, if absent it's the Trident II. Air brakes are also on the rear fuselage, the undercarriage is longer, bigger cockpit and bigger wing.
Some ground shots of the Trident ( SO 9000) show what looks like a missing shroud on the intake area. I don't know if this is indicative of the engine type? Turbomeca Marbore's or Vipers?
