For the Reaction X + Y  Z, the Reaction

For the reaction X + Y  Z, the reaction rate is found to depend only upon the concentration of X. A plot of 1/X verses 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]