Final answer:
The primary difference between a two-point turn and a three-point turn is that during a two-point turn, the driver does not need to back up, while a three-point turn necessarily involves backing up as part of the maneuver.
Step-by-step explanation:
The difference between a two-point turn and a three-point turn is how many points of turning your vehicle makes to change direction on a narrow road. A two-point turn involves the driver changing direction by driving forward into a driveway or an alley and then reversing back into the direction they wish to go. This type of turn does not require you to back up beforehand. In contrast, a three-point turn, also known as a Y-turn or K-turn, is utilized when the road is too narrow to complete a U-turn. This maneuver typically involves the driver moving forward to the right edge of the road, then backing up while turning into the left, and finally, driving forward to complete the change of direction. Therefore, backing up is a necessary part of a three-point turn.
A correct choice based on this explanation would be: 1) In a two-point turn, you do not have to back up, but in a three-point turn, you must back up.