The answer is : monocular depth
Monocular depth affect the perception that is held by an individual on<u> how far an object is located based on how big</u> the object look like in that individual's vision.
When the driver cross the railroad, the driver most likely thought that the train is still located far away form him/her because it looks small in the driver's perception. He misjudge it and caused the crash in the end.
"A. <span>Farmers made no profit of their own after paying off the land owner" is the best option from the list, although it should be noted that occasionally profits were made. </span>
I think the answer is 5 to 10