Which of the following region represents 90 Percent of all terrestrial ice?

Antarctic continental region

The correct answer is Option 4 - Antarctic continental region

The Antarctic continental region extends over 14 million square kilometers and comprises 26 percent of the world’s wilderness area, representing 90 percent of all terrestrial ice and 70 percent of planetary fresh water. The Antarctic also extends to a further 36 million square kilometers of ocean. It has a limited terrestrial life and a highly productive marine ecosystem, comprising a few plants (e.g. microscopic algae, fungi, and lichen), marine mammals, fish, and hordes of birds adapted to harsh conditions, as well as the krill, which is central to the marine food chain and upon which other animals are dependent.