The figure below shows a line graph and two shaded triangles that are similar:
Which statement about the slope of the line is true?
A. It is -1/3 throughout the line.
B. It is -3 throughout the line.
C. The slope from point O to point A is 1/3 times the slope of the line from point A to point B.
D. The slope from point O to point A is three times the slope of the line from point A to point B.
