List five example of redox reaction

Redox reaction is a type of reaction in which the oxidation and reduction occurs simultaneously.5 examples of redox reactions are given below.

Explanation:

  FAD+2e-+2H+=FADH2

   NAD+e+H+=NADH

    FMN+2e-+2H+=FMNH2

     1/2O2+e-+2H+=H2O

     Oxidized glutathione+NADPH=Reduced glutathione+NADP+H+

im pretty sure its b

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.