A string is stretched between fixed points separated by \( 75 \mathrm{~cm} \). It is observed to...

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A string is stretched between fixed points separated by \( 75 \mathrm{~cm} \). It is observed to have resonant frequencies of \( 420 \mathrm{~Hz} \) and \( 315 \mathrm{~Hz} \). There are no other resonant frequencies between these two. The lowest resonant frequency for this string is
(a) \( 155 \mathrm{~Hz} \)
(b) \( 205 \mathrm{~Hz} \)
(c) \( 10.5 \mathrm{~Hz} \)
(d) \( 105 \mathrm{~Hz} \)
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