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In a guitar, two strings \( A \) and \( B \) made of same material are slightly out of tune and produce beats of frequency \( 6 \mathrm{~Hz} \). When tension in \( B \) is slightly decreased, the beat frequency increases to \( 7 \mathrm{~Hz} \). If the frequency of \( A \) is \( 530 \mathrm{~Hz} \), the original frequency of \( B \) will be:
(A) \( 523 \mathrm{~Hz} \)
(B) \( 524 \mathrm{~Hz} \)
(C) \( 536 \mathrm{~Hz} \)
(D) \( 537 \mathrm{~Hz} \)
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