You start a search for a buried object by marking the center of a field as (0,0), with coordinates giving distances in yards. Coordinates to the north or east are positive, and coordinates to the south and what are negative. You find nothing at (-10 , 6), so you try a likely looking spot 3 yards to the east and 13 yards to the south of the first spot. What are the coordinates of the second spot?

A: (-7, -6)
B: (12, -6)
C: (-13, -9)
D: (5, -3)

Starting at (0,0), moving 3 yards to the east brings us to the point (3,0) because we are not moving north or south. Then, moving 13 yards to the south brings us to the point (3, -13) because we are not moving west or east. Therefore, the coordinates of the second spot are (3, -13), which corresponds to answer choice D: (5, -3).