The correct answer is: C. Oligocene
The Oligocene epoch was the third epoch of the Paleogene period and lasted from 33.9 to 23.03 million years ago. It was preceded by the Eocene epoch and followed by the Miocene epoch. The Oligocene epoch is characterized by the rise of the first modern mammals, including horses, camels, and rhinoceroses. It also saw the beginning of the cooling trend that would eventually lead to the Ice Age.
The Oligocene epoch is divided into three stages: the Rupelian, Chattian, and Aquitanian. The Rupelian stage was the first stage of the Oligocene epoch and lasted from 33.9 to 28.1 million years ago. It was characterized by the rise of the first modern horses. The Chattian stage was the second stage of the Oligocene epoch and lasted from 28.1 to 23.03 million years ago. It was characterized by the rise of the first modern camels and rhinoceroses. The Aquitanian stage was the third and final stage of the Oligocene epoch and lasted from 23.03 to 20.43 million years ago. It was characterized by the beginning of the cooling trend that would eventually lead to the Ice Age.
The Oligocene epoch was a time of great change on Earth. The climate was cooling, and the first modern mammals were beginning to evolve. The Oligocene epoch also saw the rise of the first primates, including the ancestors of humans.
The Oligocene epoch is a fascinating time in Earth’s history. It was a time of great change, and it saw the rise of many of the animals that we know today.