Tropospheric ozone is produced when air pollutants from automobiles and factories chemically react with sunlight. The ozone that is produced in the Earth's troposphere traps heat close to the surface of the Earth. Global industrialization is causing an increase in tropospheric ozone that will most likely lead to

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i think   the answer is c hope i'm right

considering the question as per the attachment

here we can see that the radon nuclide has 222 as the atomic mass number and 86 as the atomic number.

when it undergoes nuclear fission it gives polonium which has atomic mass number as 218 and atomic number will be 84 along with a helium nucleus which has 4 atomic mass number and 2 as its atomic number.

222 = 218 + 4 (atomic mass number)

86 = ? + 2; therefore ? = 86-2 = 84.

the atomic mass number of polonium will be 84.