The Cloth Wrappings from a Mummified Bull Found in a Pyramid

The cloth wrappings from a mummified bull found in a pyramid in Dashur, Egypt were dated by ¹⁴C analysis. The wrappings had 78.0% of the radioactivity of living tissue. Approximately how old are the wrappings? The rate constant for the decay of ¹⁴C is 1.21 x 10^-4 yr^-1.

A) less than 500 years old
B) between 500 and 1500 years old
C) between 1500 and 2500 years old
D) between 2500 and 3500 years old
E) more than 3500 years old