In terms of geological time scale, the quaternary period consists of two epochs. They are :

The Quaternary Period is the most recent division of the Cenozoic Era, spanning from approximately 2.58 million years ago to the present day. It is characterized by significant environmental changes, including repeated glaciations and the evolution of modern humans. This period is geologically divided into two distinct epochs:

• Pleistocene Epoch: Known as the 'Ice Age,' it lasted from about 2.58 million years ago until approximately 11,700 years ago. It was marked by the expansion and retreat of massive continental ice sheets.
• Holocene Epoch: This is the current geological epoch that began roughly 11,700 years ago after the last major glacial period ended.

Other options include epochs like the Pliocene, Miocene, and Eocene, which belong to the Neogene and Paleogene periods of the Cenozoic Era, respectively. Therefore, Option B is the correct classification of the Quaternary period.