The First-Order Isomerization Reaction: Cyclopropane → Propene,has a Rate Constant

The first-order isomerization reaction: cyclopropane → propene,has a rate constant of 1.10 × 10^-4 s^-1 at 470°C and 5.70 × 10^-4 s^-1 at 500°C.What is the activation energy,E_a,for the reaction?

A) 46 kJ/mol
B) 110 kJ/mol
C) 260 kJ/mol
D) 380 kJ/mol