Electrostatics

Step 1: Determine the equivalent capacitance.
When capacitors are connected in parallel, their capacitances add directly. Therefore, Each capacitor has capacitance . Thus,
Step 2: Use the energy stored formula.
The energy stored in a capacitor is given by Substituting the values:
Step 3: Perform the calculation.

Step 4: Compare with the options.
The calculated energy stored in the system is which corresponds to option (D).
Final Answer: .