An Advantage of the Accelerator Mass Spectrometer (AMS) Method of Radiocarbon

An advantage of the accelerator mass spectrometer (AMS) method of radiocarbon dating is:

A) although not as precise as standard dating methods that count beta decays, AMS dating is less subject to problems caused by atmospheric fluctuations in 14C.
B) AMS dating is much cheaper than standard dating methods that count beta decays.
C) AMS dating requires much smaller carbon samples than standard dating methods.
D) AMS dates are easier to calibrate than standard radiocarbon dates.