The correct option is $A$ Frequency of driving force
In forced oscillation,we provide energy at the mean position, which helps the body to oscillate at a constant amplitude.It basically compensate the loss of energy which occur due to surrounding energy loss. A particle oscillates simple harmonically with a frequency equal to the frequency of driving force in steady state.
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$y(x,t)\, = \,0.6\,\sin \,\left( {\frac{{2\pi }}{3}x} \right)\,\cos \,(120\,\pi t)$
where $x$ and $y$ are in $metre$ and $t$ in $second$ . The length of the string is $1.5\,m$ and its mass is $3.0\times 10^{-2}\,kg$ the tension in the string will be .... $N$