Determine the condition that will increase the amount of C4H8Br2 at equilibrium for the endothermic reaction:
C4H8 (g) + Cl2 (g) ⇌ C4H8Br2 (g)
a. removing Cl2 from the mixture
b. increasing the volume of the reaction
c. increasing the amount of C4H8
d. increasing the temperature of the reaction