The line graph shows the recorded hourly temperatures in degrees Fahrenheit at an airport. 
During which two hour period did the temperature increase the most?
A. 9 a.m. to 11 a.m.
B. 12 p.m. to 2 p.m.
C. 10 a.m. to 12 p.m.
D. 10 a.m. to 11 a.m.
Answer: A
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