A mammoth carving, designed out of a horse's shoulder blade, was found in waters covering the ancient Bering Strait and land bridge. A 0.500 gram piece of this bone was observed to undergo 1,187 carbon-14
decays in a 1 hour period. A 0.500 gram piece of bone from a modern source underwent 7,251 carbon-14
decays in the same period. Approximately how old is this bone carving?
O A. 1,200 years old
OB. 5,730 years old
OC. 7,250 years old
OD. 15,000 years old