Choose the correct statement
A. UV - C breaks down O2 molecule in the stratosphere.
B. A 1% decrease in the overhead O3 in the stratosphere results in 2% increase in UV - B intensity at the ground level.
C. UV - A is biologically, the least harmful.
D. UV - B helps in O3 dissociation in the stratosphere.
E. Chapman mechanism deals with both, O3 formation and destruction, in the stratosphere.
Choose the correct answer from the options given below:
1
A, B, C and D only
2
A, C, D and E only
3
A, B, C, D and E
4
A, B, D and E only