Over the Earth's History,landscapes Have Grown and Been Eroded,life Forms

Multiple Choice

Over the Earth's history,landscapes have grown and been eroded,life forms have evolved and become extinct,and the locations of continents and oceans have moved,all because __________

A) there is an immense amount of geologic time available for these slow changes.
B) these types of changes occurred more rapidly in the past compared with today.
C) these types of changes require very little time to accomplish.
D) as the Earth gets older,there are fewer changes that can occur.