Potassium-40 Is Useful in Determining the Age of a Fossil

Potassium-40 is useful in determining the age of a fossil in samples A) less than 25,000 years of age. B) of 40,000 to 50,000 years of age. C) 300,000 years of age and older. D) aged between 50,000 and 100,000 years of age. E) aged between 100,000 years and 250,000 years.