\( S \) and \( T \) are the foci of an ellipse and \( B \) is an end of the minor axis. If STB i...

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\( S \) and \( T \) are the foci of an ellipse and \( B \) is an end of the minor axis. If STB is an equilateral triangle, the eccentricity of the ellipse is
(A) \( 1 / 4 \)
(B) \( 1 / 3 \)
(C) \( 1 / 2 \)
(D) \( 2 / 3 \)
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