MHT CET Physics question

Six identical capacitors each of 1 F are joined in parallel and the combination is put across a battery of emf. 2 V. Now the battery is disconnected and the capacitors are joined in series. The total energy and potential difference across the series combination is

• (A)2 J and 2 V
• (B)2 J and 12 V
• (C)12 J and 2 V
• (D)12 J and 12 VCorrect