For the Reaction Cyclopropane $\rightarrow$ Propene
a Plot of Ln[cyclopropane] Vs Time in Seconds Gives

For the reaction cyclopropane $\rightarrow$ propene
A plot of ln[cyclopropane] vs time in seconds gives a straight line with slope -4.1 *10 ^{- 3} s ^{- 1} at 550 $\degree$ C.What is the rate constant for this reaction?

A) 3.9 *10 ^{- 2} s ^{- 1}
B) 8.2 *10 ^{- 3} s ^{- 1}
C) 4.1 *10 ^{- 3} s ^{- 1}
D) 1.8 *10 ^{- 3} s ^{- 1}
E) 2.1 * 10 ^{- 3} s ^{- 1}