Answer:
The correct option is C.
Explanation:
The given linear model is

Where, y is the the number of car accidents in a month and x is the number of drivers attending a program on distracted driving.
The slope intercept form of a linear function is

Where, m is the slope of the function and b is y-intercept.
From the given function it is noticed that the slope of the function is -0.0067.
It means the number of accidents was reduced by 0.0067 per month.

Therefore the number of accidents was reduced by 0.67 per month for every additional 100 drivers in the program. Option C is correct.