The Rate Constant for the First-Order Decomposition of a Particular

The rate constant for the first-order decomposition of a particular hydrocarbon is 1.85 *10^-6 s^-1 at 485 K.If the activation energy is 84.0 kJ/mol, what is the value of the frequency factor at this temperature?

A) 4.85 * 10^-4 s^-1
B) 1.11*10⁹ s^-1
C) 2.21 * 10¹ s^-1
D) 2.06 * 10³ s^-1
E) 1.81 * 10 ^-6 s^-1