Four substances (A, B, C, and D) are mixed in a test tube during a chemical reaction. The concentrations of the four substances are measured at 0s and at 100s. Time (s) [A] (mM) [B] (mM) [C] (mM) [D] (mM)

0 1 5 3 5

100 2 5 1 2

Based on the data, which substance was a product of the chemical reaction?

A.

Substance A

B.

Substance B

C.

Substance C

D.

Substance D