Carbon Dioxide Forms into a Solid (Dry Ice)at Approximately -157 $\degree$

Multiple Choice

Carbon dioxide forms into a solid (dry ice) at approximately -157 $\degree$ F.What temperature in degrees Celsius does this correspond to?

A) -157 $\degree$ C
B) -93 $\degree$ C
C) -121 $\degree$ C
D) -105 $\degree$ C