An elephant walks north from a watering hole for 1 mile. The elephant encounters a hill and turns east. The elephant continues to walk east until it
reaches a tree. It stays near the tree for 1 hour before continuing on to a
grassy field. Which point of reference should be used to describe the
elephant's motion?
A. The watering hole
B. The tree
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C. The grassy area
D. The hill
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