The hunter and gather era is to the agricultural era as the Neolithic Era is to the Paleolithic Era
Neolithic Era is to the Ice Age Era
Paleolithic Era is to the Neolithic Era
Paleolithic Era is to the Ice Age Era

C. Paleolithic era is to the Neolithic era

Explanation:
The hunter and gatherer era eventually developed into the agricultural era due to new technologies.
This can also be said for the paleolithic era. With new tools/technologies, it developed into the Neolithic era.