I believe the correct answers are A and B. the volume and the surface area don't exactly help with the force of gravity and so the correct answers really have to be A and B.
A scientist who wants to date materials older than 40,000 years would most likely use
Potassium – argon dating or K-AR dating. Potassium-40 is a radioactive isotope
of potassium that decays into argon-40. The half life of potassium-40 is 1.3
billion years far longer than carbon-14.