Reason of flying airplanes at higher altitude during long flights - Thermodynamics

Q.  Why do the airplanes fly at higher altitude during the long flights?
- Published on 21 Aug 15

a. to avoid collisions as they are at very high speed and controlling will be difficult if something (like towers, hills) comes in the way
b. it is easy to communicate with satellites at high altitudes
c. to save the fuel as air at higher altitude exerts smaller drag force on aircraft
d. none of the above

ANSWER: to save the fuel as air at higher altitude exerts smaller drag force on aircraft

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