Carbon-14,which Is Present in All Living Tissue,radioactively Decays Via a First-Order

Carbon-14,which is present in all living tissue,radioactively decays via a first-order process.A one-gram sample of wood taken from a living tree gives a rate for carbon-14 decay of 13.6 counts per minute.If the half-life for carbon-14 is 5715 years,how old is a wood sample that gives a rate for carbon-14 decay of 7.9 counts per minute?

A) 2.2 × 10³ yr
B) 3.1 × 10³ yr
C) 4.5 × 10³ yr
D) 1.4 × 10⁴ yr