The Charcoal from Ashes Found in a Cave Gave 3

The charcoal from ashes found in a cave gave 3.34 14C counts per gram per minute. Wood from the outer portion of a growing tree gives a comparable count of 16.0. The half-life of 14C is 5700 years. How old are the ashes?

A) 8.93 × 10³ yr
B) 6.87 × 10³ yr
C) 1.29 × 10⁴ yr
D) 1.93 × 10⁴ yr
E) 1.90 × 10⁴ yr