Given below are two statements: One is labelled as Assertion (A) and the other is labelled as Reason (R) :
Assertion (A): Ozone in troposhere is referred to as bad ozone.
Reasons (R): Fifty percent of ozone is troposphere is emitted directly from fossil fuel combustion and rest comes from stratosphere.
In the light of the above Statements, choose the correct answer from the options given below :