Final answer:
If turning right with a long vehicle makes it impossible to stay in the proper lane, you should stop and wait for the traffic to clear to avoid accidents and remain safe. So, the correct answer is 1) Continue turning right and try to stay in the proper lane.
Step-by-step explanation:
When turning right with a long vehicle or combination truck-trailer and it is impossible to stay in the proper lane, the appropriate action is to stop and wait for the traffic to clear. This ensures that you do not encroach on other lanes of traffic which could cause an accident or force other drivers to take evasive action. Continuing to turn right and attempting to stay in the lane without sufficient space is not safe, and turning left instead is not a logical solution to the issue. Driving on the shoulder of the road should be avoided as it is not designed for regular vehicular traffic and could present safety hazards.
Thus, the correct answer is 1) Continue turning right and try to stay in the proper lane.