Which sentence from the section "A Lot Of Bioluminescence Happens In The Ocean" BEST develops a central idea of the article? А Bioluminescence is when light shines as a result of a biochemical reaction. B This is different from other forms of light, such as phosphorescent or fluorescent light с Bioluminescence in vertebrates is found exclusively among fish living in the ocean. D However, not bioluminescent creatures live in the dark.​

first one is the correct answer

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.