Which of the following statements are true and
false?
(i) About 90% of the ozone in our atmosphere is
contained in stratosphere.
(ii) The warmest parts of our atmosphere are located
in mesosphere.
(iii) Trophosphere extends from Earth's surface upto
7 km at poles and 17-18 km at the equator.
(iv) The lowest part of thermosphere contains
ionosphere.
(v) Hydrogen and helium are prime components of
exosphere.
A 
B 
C 
D 