This road sign means:

Side road.
Keep to the side indicated by the arrow.
You may drive in the left lane.
You have the right-of-way.
The Correct Answer and Explanation is :
The correct answer is: Keep to the side indicated by the arrow.
Explanation:
The road sign in question is a “Keep Right” sign, which is used to indicate to drivers that they should stay in the right lane when navigating a particular road or section of a road. The sign is designed to ensure smooth traffic flow, safety, and compliance with road rules.
When you see a “Keep Right” sign, it means that, unless there is a valid reason (such as road conditions, merging lanes, or specific road markings) that necessitates a different lane choice, you should continue driving on the right side of the road. This type of signage is most commonly used in places where traffic management is important, such as on highways, multi-lane roads, or around intersections with multiple lanes in the same direction.
If you were to ignore this sign and drive on the left side, you would be in violation of the traffic rules and could pose a danger to other road users, leading to potential accidents or traffic violations. The primary goal of a “Keep Right” sign is to ensure that traffic flows in an orderly manner and that all vehicles are positioned appropriately, especially in areas where lanes may narrow or where certain lane usage is designated (e.g., for turns, passing, or maintaining smooth traffic flow).
This sign does not imply that you should drive in a specific lane only under certain circumstances, such as when overtaking, nor does it imply that you have the right-of-way or that it is related to side roads. It is simply instructing you to stay on the right side as indicated, maintaining road safety and effective traffic movement.