Calculate the rate constant k at 350 K for a chemical reaction with an attempt frequency of 1x10⁹ s⁻¹ and an activation energy of 15.9 kJ/mol.

a. 1.9 x 10⁻⁴
b. 2.3 x 10⁸
c. 7.7 x 10⁻³
d. 4.2 x 10⁶
e. 3.1 x 105⁻⁵