The Latitude of Washington, D

Multiple Choice

The latitude of Washington, D.C., is 39°N.The latitude of Boston, Massachusetts, is 42°N.If the difference in their average annual temperatures were determined only by their latitude difference, Washington D.C., would be how many degrees warmer than Boston? (Average air temperature over the course of a year decreases about 0.76C per degree of latitude at sea level.)

A) 1.2°C
B) 2.3°C
C) 3.0°C
D) 4.2°C
E) 12.0°C