A capacitor with capacitance 5 μF is charged to 5 μC. If the plates are pulled apart to reduce the capacitance to 2 μF, how much work is done ?

A. 2.16 × 10⁻⁶ J
B. 6.25 × 10⁻⁶ J
C. 2.55 × 10⁻⁶ J
D. 3.75 × 10⁻⁶ J