Paragraph: Carbon-14 is used to determine the age of organic material. The procedure is based on the formation of $^{14}C$ by neutron capture in the upper atmosphere. $^{14}C$ is absorbed by living organisms during photosynthesis. The $^{14}C$ content is constant in living organism. Once the plant or animal dies, the uptake of carbon dioxide by it ceases and the level of $^{14}C$ in the dead being falls due to decay. The half life period of $^{14}C$ is 5770 years.

Which of the following option is correct?