At 7 a.m. the temperature was 15 Fahrenheit below zero.By 2 p.m. the temperature rose 32 Fahrenheit and by 5 p.m.it dropped 10 Fahrenheit.What was the temperature at 5 p.m.?
A:10 degrees Fahrenheit
B:9 degrees Fahrenheit
C:7 degrees Fahrenheit
D:11 degree Fahrenheit