The Gas Phase Reaction C₂H₄ + Cl₂→C₂H₄Cl₂ Follows the Rate

The gas phase reaction C₂H₄ + Cl₂→C₂H₄Cl₂ follows the rate law:
Rate = k [C₂H₄] [Cl₂]². If the concentration of C₂H₄ is doubled while the concentration of Cl₂ remains constant, the initial rate of the reaction:

A) increases by a factor oF₄.
B) decreases by a factor of 2.
C) increases by a factor of 2.
D) increases by a factor of 1.5.
E) remains constant.