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Question:

If you are changing lanes, preparing to pass another vehicle, or entering traffic, signal and check for passing traffic by first using your mirrors and then

A
Explaination

If you are changing lanes, preparing to pass another vehicle, or entering traffic, signal and check for passing traffic by first using your mirrors. Once the mirrors reveal safe conditions for the lane change, check your vehicle's blind spot by glancing over your shoulder to the rear in the direction of the lane change.