What is the greatest length x such that \(3 \dfrac{1}{2}\) m and \(8 \dfrac{3}{4}\) m are integral multiplies of x?

• A. \(1 \dfrac{1}{2} \ m\)
• B. \(1 \dfrac{1}{3} \ m\)
• C. \(1 \dfrac{1}{4} \ m\)
• D. \(1 \dfrac{3}{4} \ m\)