Answer:
The correct answer is option 1, that is, being able to carbon date fossils.
Step-by-step explanation:
With the help of daily exposure to radioisotopes of the organisms, the scientists have found the concept of carbon date fossils. The age of the organic matter can be found from the relative ratios of C-12 and C-14, that is, the isotopes of carbon with the application of carbon dating. This proportion modifies over the years as carbon-14 decays and does not get replaced as there is no exchange with the atmosphere.