66. The half-life of 14C is 5730 years. A sample taken for radiocarbon dating has been found to contain56 % of its original 14C. Which of the following options is the best estimate for the age of the sample? (Radioactive decay of 14C follows first-order kinetics.)
(A)4.8x102
(B) 4.8x103
(C) 4.8x 105
(D) 4.8 x 106
(E) 4.8 x 100