You are driving at night and you see a bicyclist approaching from the opposite direction

slow down to a safe speed and avoid using your high beam headlights.

Explanation:

Using your high beams may scare or blind the incoming biker, If high beams are already on, turn them down because the biker can see you either way in a dark setting (night time).

The reason why "Slow down and avoid using your high beams" would be the correct answer because this will ensure the safety of the bicyclist and the driver.

It is recommended that you slow down when you see a bicyclist, so that whenever something inconvenient happens, you would have enough time to react, including the bicyclist. If you hit the bicyclist, but you were maintaining a slower speed, then the injures would probably be minimal.

High beams should not be used when there's a bicyclist approaching ahead, due to the fact that the bicyclist could get blinded from the light and wouldn't be able to see what's ahead of them. It would be a risk for the bicyclist because they wouldn't be able to see what's ahead of them, and could possibly collide with your car.

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who knows? not you apparently