If You Visited Mount Marvel City (Elevation 900 M)and Found

If you visited Mount Marvel City (elevation 900 m) and found the outside air temperature to be 27°C,what would be the air temperature at the summit of Mount Marvel (elevation 4200 m) at that moment-assuming that the temperature conditions with altitude change at an average,or normal,lapse rate?

A) 2°C.
B) 48°C.
C) 5) 9°C.
D) 10°C.