The equation has a unique solution, if are
Natural numbers
Consider,
A. is a solution of
B. If positive real numbers are chosen, will have many solutions.
C. If real numbers are chosen, will have infinite solutions.
D. If rational numbers are chosen, will have many solutions.
A linear equation in two variables has infinitely many solutions. For the linear equations system, there is a solution set of infinite points for which the L.H.S of an equation becomes R.H.S.
Therefore, for the unique solution of the given equation, the values will be a natural number.
Therefore, the correct option is A.