human
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:
A) The box is a lot lighter than it was earlier
B) the box being grey
C) his box being more voluminous
D) the ramp is more high angle then it was earlier
gpt
The correct answer is 3: the ramp is more high angle then it was earlier.