Final answer:
When changing lanes, you must yield to vehicles in the lane you want to enter.
Step-by-step explanation:
When changing lanes, you should follow these guidelines:
- Check your mirrors and blind spot
- Signal your intention to change lanes
- Yield to vehicles in the lane you want to enter
- Move into the lane when it is safe to do so
Option a) is correct: You must yield to vehicles in the lane you want to enter. Option b) is incorrect: Vehicles in that lane are not required to let you in, but they may choose to do so if you signal. Option c) is incorrect: Crowding the lane divider is dangerous and not recommended.