The kinetics of the reaction of crystal violet with excess sodium hydroxide to form colorless produc — Kinetics Chemistry Question

The kinetics of the reaction of crystal violet with excess sodium hydroxide to form colorless products is monitored using a spectrophotometer. A plot of the natural logarithm of the absorbance of green light by the system as a function of time is linear with a negative slope. Which conclusions may be drawn from the data?
I. The reaction is first-order in crystal violet.
II. The reaction is first-order in hydroxide ion.