Answer:
Answer is option B) 2
Step-by-step explanation:
A parking garage opens at 8 am. The given graph shows number of cars at y axis and time at x axis.
Now we have to find the slope of the line shown in the graph.
This line passes through two points (0, 60) and (10, 80)
Slope of a line is represented by 
Now we put the values in the formula

m = 2
Therefore, answer is option B) 2