What is bias in an experiment?
a. something that makes the experiment more reliable
b. something that makes the experimental results clearer
c. something that the scientist analyze the data
d. something that pushes the experimental results one way or another

D.

Explanation:

It pushes the experimental results one way or another.  Less reliable.

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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.