A piece of wood from a recently cut tree shows 20 decays per minute. A wooden piece of same size in a museum (obtained from a tree cut years back) shows 2 decay per minute. If the half-life of \( \mathrm{C}^{14} \) is 5730 years, then the age of the wooden piece placed in the museum is approximately:

A 10439 years

B 13094 years

C 19039 years