For the Reaction X + Y → Z,the Reaction Rate

For the reaction X + Y → Z,the reaction rate is found to depend only upon the concentration of X.A plot of 1/X versus time gives a straight line. What is the rate law for this reaction?

A) rate = k [X]
B) rate = k [X]²
C) rate = k [X][Y]
D) rate = k [X]²[Y]
E) rate = k [X]²/[Y]