The earth was nearly covered with snow and ice in pleistocene Era. The Pleistocene is the geological epoch which lasted from about 2,588,000 to 11,700 years ago, spanning the world's recent period of repeated glaciations.

Correct Option: C

The earth was nearly covered with snow and ice in pleistocene Era. The Pleistocene is the geological epoch which lasted from about 2,588,000 to 11,700 years ago, spanning the world's recent period of repeated glaciations.

limestone caverns

Correct Option: B

limestone caverns