Question: Eric is pushing a box up a ramp. He notices that it is much more difficult than it was a couple of hours earlier. This could be due to
Choices:
text: The box is a lot lighter than it was earlier
label: A
text: the box being grey
label: B
text: his box being more voluminous
label: C
text: the ramp is more high angle then it was earlier
label: D
Answer: D