$t_{1/4}$ can be taken as the time taken for the concentration of a reactant to drop to $\large\frac{3}{4}$ of its initial value. If the rate constant for a first order reaction is K, the $t_{1/4}$ can be written as

Question

$(a)\;0.10/K\\(b)\;0.29/K \\ (c)\;0.69/K \\ (d)\;0.75/K$