Find potential at point O.

Fig.
(A)  V 1 + V 2 + V 3 2
(B)  V 1 V 2 + V 2 V 3 + V 3 V 1 V 1 + V 2 + V 3
(C)  V 1 C 1 + V 2 C 2 + V 3 C 3 C 1 + C 2 + C 3
(D) Zero

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