It is important to move well to the left or right when preparing to make a turn to avoid blocking through traffic. Thus the correct answer is A.
When many vehicles move on the road indicates traffic. When this vehicle disturbs the management of vehicles and suddenly appears at one location causes a traffic jam.
When getting prepared to make a turn, is it crucial to go easily to the left or right to avoid getting stuck in traffic because doing so will make it difficult to go forward and arrive safely.
Therefore, option A is appropriate.
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