Kris obtained the equation n(n−20)=n

and claims that, after dividing each side by n, she gets the equation

n−20=1,

which is solved by

n=21.

Is Kris correct, or has she overlooked a possibility?

Choose the correct answer below. Use the Show Work learning aid to provide related calculations and additional reasoning to support your answer.

A.

Kris is correct.

B.

Kris is not correct since

n=0

is also a solution.

C.

Kris is not correct because

n=21

is not a solution.