Pick out the wrong statement.

A. The concentric layer in atmosphere which contains about 70% of the total mass of atmosphere and characterised by a steady decrease in temperature is called stratosphere

B. Stratosphere is rich in ozone and is located just above the troposphere

C. Troposphere is a turbulent dusty zone containing much of water vapor and clouds

D. The earth's atmosphere is an envelope of gases extending upto a height of about 200 kms

Answer: Option A