The Slope of a Curved Line Can Be Approximated by

The slope of a curved line can be approximated by

A) the average of the variable measured along the y-axis divided by the average of the variable measured along the x-axis.
B) the slope across an arc from one point on the curve to another point on the curve.
C) the inverse of the straight-line method.
D) the average of the variable measured along the x-axis divided by the average of the variable measured along the y-axis.