In an experiment (reactant $\rightarrow$ product) we observe that if we increase the reactant to twice then time taken in the concentration of reaction to drop to $\large\frac{1}{2}$ of its value is reduced to $\large\frac{1}{4}$ then order is

Question

$(a)\;0\qquad(b)\;1\qquad(c)\;2\qquad(d)\;3$