What is the value of work done in the following diagram?

• A. m1 (h2 – h4) + m2 (h5 – h6)
• B. m1 (h2 – h1) + m2 (h6 – h5)
• C. m1 (h2 – h8) + m2 (h5 – h8)
• D. m1 (h2 – h5) + m2 (h4 – h8)