Exhibit 13-1 This Graph Shows the Concentration Vs

Exhibit 13-1 This graph shows the concentration vs. time data needed for the following question(s) .
-Refer to Exhibit 13-1. What is the instantaneous rate at which concentration decreases at 30 s?

A) - 1.1×10 ^{- 4} mol/L × s
B) - 1.1×10 ^{- 2} mol/L × s
C) 1.1×10 ^{- 3} mol/L × s
D) 893 mol/L × s
E) cannot answer from the data given