A pebble is dropped in a lake; and it produces ripples with a frequency of \( 0.25 \mathrm{~Hz} ...

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A pebble is dropped in a lake; and it produces ripples with a frequency of \( 0.25 \mathrm{~Hz} \). When should a second pebble be dropped at the same place to produce destructive interference?
(A) \( 0.50 \mathrm{~s} \) after the first
(B) \( 1.0 \mathrm{~s} \) after the first
(C) \( 2.0 \mathrm{~s} \) after the first
(D) \( 0.75 \mathrm{~s} \) after the first
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