Answer:
size get smaller maybe there is no object remaining
They are based on layers of rock the correspond to certain time periods, so my guess would be D.
The fusion reaction that is easiest to accomplish is the reaction between two hydrogen isotopes: deuterium, extracted from water and tritium, produced during the fusion reaction through contact with lithium. When deuterium and tritium nuclei fuse, they form a helium nucleus, a neutron and a lot of energy.
