Answer:
D. The slope of the graph will be zero.
Step-by-step explanation:
Slope of a line is given as .
For a horizontal line, the rise is always equal to zero since the line doesn't rise vertically. This means, .
No matter the value of the run, , when we divide zero by the value of the run, we would always have 0.
Therefore, the slope of an horizontal line would always be zero.