The Rate of Disappearance of HI in the Reaction 2 $\to$

The rate of disappearance of HI in the reaction 2 HI(g) $\to$ I₂(g) + H₂(g) is shown in the following figure.What is the approximate average rate of reaction over the first 15.0 seconds of the reaction?

A) 0.275 M/s
B) 0.138 M/s
C) 0.0117 M/s
D) 0.00917 M/s
E) 0.0183 M/s