Correct Answer: C
Explanation:
This question is trying to put a mathematical definition to a real life situation. First, recall the definitions of parallel and perpendicular lines, since those terms are among the answer selections.
Parallel lines: In a plane, parallel lines are lines that will never intersect. This means they have the same slope but different intercepts.
Perpendicular lines: In a plane, perpendicular lines are lines that intersect by creating a 90o degree angle. This also means they have opposite sign, reciprocal slopes.
Now, look at the aspects of this particular problem.
"A truck is traveling down a hill"
From this statement, it cannot be assumed that the hill is a straight line nor can it be assumed that the hill goes on forever. Therefore, the truck and the hill will never be parallel. Also, for these same reasons it is known that the truck will never be perpendicular to the hill. The relation of the truck's tires to the hill will never be parallel since they constantly touch.
Thus, the correct answer choice is,
"The body of the truck is not perpendicular to the hill."