A Wooden Artifact Is Subjected to Radiocarbon Dating

A wooden artifact is subjected to radiocarbon dating.The activity associated with its ¹⁴C content is 12 dis min^-1 g^-1.A sample of wood from a modern source gave 15 dis min^-1 g^-1.If the half-life of ¹⁴C is 5730 y,what is the age of the artifact?

A) 1.8 × 10³ y
B) 800 y
C) 1.3 × 10³ y
D) 7.2 × 10³ y