When changing lanes, you should:

A. Adjust your speed to match traffic in the new lane

B. Move over several lanes at once

C. Wait until you're at an intersection to perform the maneuver

A is correct

B is incorrect because that is the opposite of what you should do, changing lanes should not be done over multiple lanes

C is incorrect because at an intersection, there would be solid lines on the road you could not legally, nor smoothly drive over