This time period lasted for more than half of the hypothesized history of the Earth. A. Carboniferous B. Paleozoic C. Cretaceous D. Precambrian

The answer is a. carboniferous, because in geologic time the last period of the paleozoic era. The permain period began 298.9 millions years ago and ended 252.2 millions ago, extending from the close if the carboniferous period to the upset of the Triassic period.