$\begin{array}{1 1}(A)\;6 \\(B)\;12 \\(C)\;18 \\(D)\;25 \end{array} $

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If t is the time for N oscillations, the $T =\large\frac{t}{N}$ and $\Delta T =\large\frac{\Delta t}{N}$

Here , $\large\frac{\Delta T}{T} =\frac{0.67 }{100} =\frac{2}{300}$

$\Delta t = \large\frac{1}{3}$$s$

and $T= 2s$

$N= \large\frac{\Delta t}{\Delta T}= \frac{\Large\frac{1}{3}}{(2/300)(2)} $

$\qquad= 25$

Hence D is the correct answer.

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