Which of the following expressions simplifies to a rational number?

MATHEMATICS · Single correct · AoPS · Mathematics · Follow the Rules · Follow the Rules

Problem

Which of the following expressions simplifies to a rational number? (a)

\sqrt{32}+\sqrt{18}+\sqrt{50}

(b)

\sqrt{72}-\sqrt{32}-\sqrt{8}

(c)

\sqrt{50}-\sqrt{32}-\sqrt{18}

(d)

\sqrt{72}-\sqrt{18}-\sqrt{8}