The scatter plot shows the relationship between the number of car accidents in a month and the number of drivers attending a program on distracted driving. the equation represents the linear model for this data. y=−0.67x+17

what does the number -0.67 in the equation mean in this context?

the number of accidents was reduced by 0.67 per month for every additional driver in the program.
the number of accidents was reduced by 0.67 per month for every additional 100 drivers in the program.
there were 0.67 accidents per month.
the number of accidents increased by 0.67 per month for every additional 100 drivers in the program.
the number of accidents was reduced by 0.67 per month every month.