The students became interested in investigating the properties of carbon dioxide gas at extreme pressures and temperatures. However, they noticed that the state diagram provided to them did not extend to such extreme conditions. Based on the provided state diagram, which of the following extreme pressures and temperatures is carbon dioxide gas most likely to exist as?

A. 500 kPa and 1000℃

B. 500 kPa and -1000℃

C. 50,000 kPa and -1000℃

D. Carbon dioxide cannot exist at extreme conditions.