What assumption must be true for radiocarbon (14C) dating to be useful?
A) (14C) has the same mass as 12C.
B) A constant concentration of 14C is maintained in living plants and animals through equilibration with atmospheric levels of 14C.
C) The sample cannot have been chemically altered prior to the analysis.
D) (14C) always decays at the same rate.
E) (14C) is nonradioactive.
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