Correct answer is (a) Complete inhibition
For explanation: Linear inhibition is sometimes called complete inhibition, and the contrasting term partial inhibition is sometimes used for a type of non-linear inhibition in which saturation with inhibitor does not decrease the rate to zero. These latter terms are discouraged because they can be misleading, implying, for example, that the rate may indeed be decreased to zero in ‘complete inhibition’ at non-saturating concentrations of inhibitor.