Scientists believe the amount of rock 50 million years from now will be the same as the current amounts. What evidence could be cited for the previous claim? The

a - total amount of rock on Earth appears to be constantly cycling
b - amount of sedimentary rock increases while the amount of metamorphic rock decreases
c -
amount of igneous rock increases while the amount of sedimentary rock decreases
d - total amount of rock on Earth fluctuates greatly