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. 10 a.m. to 11 a.m.
B. 9 a.m. to 11 a.m.
C. 12 p.m. to 2 p.m.
D. 10 a.m. to 12 p.m.
Answer: B
Mathematics
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