I initially got 104 too.
Is the trick of the question the fact that it says "The
average true course of the great circle is 100°" ??
In that case 100 would be the GC track in between A to B.
Hence, GC at A would be 096 and GC on arrival at B would be 104. (Convergency being 8)
and since Conversion Angle is 4... RL at A would then be 100.
