The Reaction of Substance a with Substance C Was Carefully

The reaction of substance A with substance C was carefully studied under conditions where the [C] remained essentially constant. The graph of [A] vs. time gave a straight line while the graph of ln[A] vs. time and that of 1/[A] vs. time both gave curves.

A) The reaction is therefore zero order with respect to A.
B) The reaction is therefore one-half order with respect to A.
C) The reaction is therefore first order with respect to A.
D) The reaction is therefore second order with respect to A.
E) The reaction is therefore third order with respect to A.