During the chlorination of silicon, chlorine gas is reacted with solid silicon to form silicon tetrachloride.
Si(s) + 2Cl₂(g) + heat ↔ SiCl₄(g)

Which WILL NOT cause the equilibrium of the reaction to shift towards the products?

a. adding a catalyst
b. increasing the pressure
c. increasing the temperature
d. increasing the mass of both reactants and products by 20%