The correct answer is D) 100 feet.
When approaching an intersection, bridge, or railroad crossing, you should never drive (pass) on the left half of the roadway when within 100 feet.
This is a traffic disposition you have to strictly follow to avoid any accidents. That is the proper distance to stay in your line, approach the intersection, turn on your turn signal with anticipation so other drivers know what you are about to do. If you are not going to make a turn, you carefully watch to both sides and then cross. This shows that you are a good driver.
