A Temperature Measurement from the Earth's Stratosphere Is Taken as -68

A temperature measurement from the Earth's stratosphere is taken as -68 ${ } ^ { \circ } \mathrm { F }$ . The temperature on the Earth's surface below is found to be 42 ${ } ^ { \circ } \mathrm { F }$ . Find the difference between the surface temperature reading and the stratosphere temperature reading.

A) -27 ${ } ^ { \circ } \mathrm { F }$
B) -26 ${ } ^ { \circ } \mathrm { F }$
C) 27 ${ } ^ { \circ } \mathrm { F }$
D) 110 ${ } ^ { \circ } \mathrm { F }$
E) 26 ${ } ^ { \circ } \mathrm { F }$