A

Step 1: Analyze the given combinations of capacitors.
Capacitors C1, C2, and C3 are in series and can be analyzed using series capacitor rules. In a series configuration, the charge is the same for all capacitors.

Step 2: Evaluate Statement I.
Energy stored in capacitors is given by:
$$ U = \frac{1}{2} C V^2 $$
This implies that the energy stored in C1 is equal to the energy stored in C2 plus the energy stored in C3 when you consider a common potential difference across them. Hence, Statement I is correct.

Step 3: Evaluate Statement II.
Charge is indeed shared in a series connection, so the charge on C1 is equal to the sum of the charges on C2 and C3, which implies Statement II is also correct.

Step 4: Evaluate Statement III.
In a series configuration, while charges are the same, the potential drop across different capacitors is not necessarily equal, especially if the capacitances differ. Therefore, Statement III is incorrect.

Conclusion: Thus, Statements I and II are correct, leading to Option A (I and II) as the correct answer.