These look like displacement/distance questions
A. (DISTANCE) If Teddy went 8 feet underwater and 8 back to the surface he swam a total of 16 feet.
B. (DISPLACEMENT) They are looking at the final position compared to the initial position for this one. If you go 1.5 miles west and then 1.5 miles east, you're right back to where you started. So 0 miles away from the house. They do not want total distance travelled they want displacement.
C. (DISTANCE) You start at -50 feet (vertically, compared to sea level I'm guessing) and end up at 50 feet above vertically so you travelled a distance of 100 feet.
D. (DISTANCE) The change from -3 degrees to 3 degrees is 6 degrees.
