A reaction has an activation energy of 209 kJ mol?1. The rate increases 10?fold when the temperature is increased from 27?C to X ?C. The temperature X is closest to [Gas constant, R = 8.314 J mol?1K?1]

a. 35
b. 40
c. 30
d. 45

Use this equation
ln(k2/k1)= -Ea/R(1/T2-1/T1)
Take temp in Kelvin and Ea in J/mol
k2/k1= 10
Check if you are getting answer.