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As shown in the figure, charges \( +\varphi \) and \( q \) nre placed at the vertices \( B \) and \( C \) of an isosceles triangle. The potential at the vertex \( A \) is
(A) \( \frac{1}{4 \pi \varepsilon_{13}} \cdot \frac{2 q}{\sqrt{a^{2}+b^{2}}} \)
(B) ZCTTO
(C) \( \frac{1}{4 \pi E_{0}} \cdot \frac{4}{\sqrt{a^{2}+b^{2}}} \)
(D) \( \frac{1}{4 \pi e_{0}} \cdot \frac{(-c)}{\sqrt{a^{2}+b^{2}}} \)
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