which type of layer extends from an average altitude of 11 to 50 Kilometers above the Earth's surface

which type of layer extends from an average altitude of 11 to 50 Kilom

1.	which type of layer extends from an average altitude of 11 to 50 Kilometers above the Earth's surface
A.	Stratosphere
B.	Troposphere
C.	Mesosphere
D.	Inosphere
Answer» B. Troposphere