Given below are two statements: One is labelled as Assertion \((A)\) and other is labelled as Reason \((R)\). Assertion \((A)\) : Time period of oscillation of a liquid drop depends on surface tension \((S)\), if density of the liquid is \(p\) and radius of the drop is \(r\), then \(T = k \sqrt{ pr ^{3} / s ^{3 / 2}}\) is dimensionally correct, where \(K\) is dimensionless. Reason \((R)\): Using dimensional analysis we get \(R.H.S.\) having different dimension than that of time period. In the light of above statements, choose the correct answer from the options given below.

1. A Both \((A)\) and \((R)\) are true and \((R)\) is the correct explanation of \((A)\)
2. B Both \((A)\) and \((R)\) are true but \((R)\) is not the correct explanation of \((A)\)
3. C \((A)\) is true but \((R)\) is false
4. D \((A)\) is false but \((R)\) is true