Looking at the picture, take the easiest instrument first (compass)... Aircraft is heading west hence number 2 is eliminated as it is heading north west.
Next, look at the artificial horizon - it is showing a level decent which also excludes number 2 but also number 4.
this leaves 1 & 3 as options.
finally looking at the RBI - imagine you are in the aircraft. Imagine the 'north' or '0' position on the RBI as pointing towards the aircraft nose as you look at it from inside of the aircraft. The needle will always point towards the beacon. Therefore the answer is number 1.
Steve