How can Karel avoid obstacles in its path?

Karel can effectively avoid obstacles in its path by being programmed to check for walls using the frontIsClear() command before attempting to move forward. This command allows Karel to assess whether the space directly in front of it is clear of obstacles. If the path is clear, Karel can safely move forward; if an obstacle or wall is detected, Karel can choose a different action, like turning or stopping, which prevents it from running into the obstacle.

In contrast, ignoring beepers on the path does not help Karel navigate around physical obstacles effectively, as beepers do not represent barriers in this context. Employing random movement patterns lacks efficiency and predictability, making it difficult for Karel to navigate around obstacles systematically. Finally, stopping at intersections does not necessarily equate to avoiding obstacles; it may only prevent Karel from moving forward without a strategy for dealing with walls or barriers. Therefore, programming Karel to check for walls using frontIsClear() is the most reliable method for maintaining a clear path.