They have the same mass as the mass of the reactants. evidence to back this up is the law of conservation of mass
Lines up in the middle of the cell
A) is your best answer.
Relative Dating gives the 'relative dating', which allows one to find the difference of age between many different of fossils. However, radioactive dating is used to get a more exact measurement of a fossil, but it can only be used for certain types of fossils.
hope this helps
