Refer to the Reaction
Cr₂O₇^2-(aq) + 6 I^-(aq) + 14 $\rightarrow$

refer to the reaction
Cr₂O₇^2-(aq) + 6 I^-(aq) + 14 H⁺(aq) $\rightarrow$ 2 Cr³⁺(aq) + 3 I₂(aq) + 7 H₂O(l)
for which the following initial instantaneous rates of reaction were obtained.

-A graph of (Cr₂O₇^2-) versus time would most closely resemble

A) a straight line with a negative slope.
B) a straight line with a slope of zero.
C) a straight line with a positive slope.
D) a curve in which the Cr₂O₇^2- concentration decreases rapidly at first, and then the rate at which Cr₂O₇^2- disappears slows down with time.
E) a curve in which the Cr₂O₇^2- concentration increases rapidly at first, and then the rate at which Cr₂O₇^2- appears slows down with time.