The correct answer is A. Slow down and glance down at the right edge of the road as a guide for your lane position.
Explanation:
High-beam headlights on other cars can cause you are temporarily blinded, which reduces your abilities to drive properly and increases the chances of accidents. Due to this, if there is an oncoming vehicle with high-beam headlights on the general recommendation is to avoid staring directly and instead look toward the right, while still being aware of the lane position. In this way, your vehicle is in the lane and you avoid accidents while the other car passes. Besides this, it is a good idea to slow down just to reduce any risk as you are not looking directly at the position of the other car. Thus, option A describes the correct reaction in this situation.
The prounoun "that" is used as a demonstrative pronoun in your sentence because it is used to demonstrate, or indicate something. In your sentence, that indicates which horse is your favorite.
