By how many degrees Celsius has the mean global temperature risen since 1880? 

A)  0.65 
B)  0.75 
C)  0.85 
D)  0.95

Mean Global Temperature

The average temperature of the Earth's surface as measured across various global locations over a specific period.

Degrees Celsius

A unit of temperature measurement in the metric system where water freezes at 0 degrees and boils at 100 degrees under standard atmospheric conditions.