In a triangle \( \mathrm{ABC}, \angle \mathrm{A}=60^{\circ} \) and ...

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In a triangle \( \mathrm{ABC}, \angle \mathrm{A}=60^{\circ} \) and \( \mathrm{b}: \mathrm{c}=(\sqrt{3}+1): 2 \) then \( (\angle \mathrm{B}-\angle \mathrm{C}) \) has the value equal to
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(A) \( 15^{\circ} \)
(B) \( 30^{\circ} \)
(C) \( 22.5^{\circ} \)
(D) \( 45^{\circ} \)
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