The correct answer is Radiocarbon dating
Absolute dating is used to determine the absolute age of the fossil. Radiocarbon dating is used to determine the absolute age of the fossil, by using carbon dating we calculate the amount of carbon left in the organic matter(fossil). The cosmic radiation entering the earth produces C-14 moves up in the food chain and as plants use carbon atoms present in the atmosphere for photosynthesis and this carbon is transferred from plants to animals. This carbon takes 5730 years to decay into half and convert into nitrogen. This is how we know the age of carbon and the amount of carbon left in the fossil determines the age of the fossil absolutely.
