Energy, work and power — practice question

An object with mass $m$ drops from an upper shelf to a lower shelf. What amount of gravitational potential energy is lost by the object?

• A$mg h_2$
• B$\left(\frac{m}{g}\right) h_2$
• C$\left(\frac{m}{g}\right)(h_1 - h_2)$
• D$mg(h_1 - h_2)$