$t_{1/4}$ can be taken as the time taken for the concentration of a reactant to drop to $\frac{3}{4}$ 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 ) $0.69/K$
( B ) $0.10/k$
( C ) $0.75/k$
( D ) $0.29/k$