A runner runs 10 m from the origin toward the WEST to point A. He then runs from point A 20 m more toward the EAST to point B. He then runs from point B 30 m more toward the WEST to point C. The runner's total displacement from the origin to point C is:. a. 20 m toward the WEST
b. 50 m toward the WEST
c. 60 m toward the WEST
d. 10 m toward the WEST.