the total mass of the rock the rate at which the rock formed the types of fossils that the rock contains the amount of time passed since the rock formed
I am hesitating between 4 options to answer the following question, which option should I choose?
Question: The radioactive isotope content of a rock can be used to identify which property of the rock?
Possibilities:
- the total mass of the rock
- the rate at which the rock formed
- the types of fossils that the rock contains
- the amount of time passed since the rock formed

the amount of time passed since the rock formed