(单选题)The moving average crossover rule

A、isafundamentalapproachtoforecastingexchangerates.
B、statesthatacrossoveroftheshort-termmovingaverageabovethelong-termmovingaveragesignalsthattheforeigncurrencyisappreciating.
C、statesthatacrossoveroftheshort-termmovingaverageabovethelong-termmovingaveragesignalsthattheforeigncurrencyisdepreciating.
D、noneoftheoptions