What is the value of m2 / m1 in the following diagram?

• A. (h2 – h4) / (h5 – h8)
• B. (h6 – h4) / (h7 – h8)
• C. (h1 – h4) / (h6 – h8)
• D. (h2 – h1) / (h1 – h8)