Which environmental feature best aids Opal's mobility with her leg braces?

Clear pathways are crucial for facilitating Opal's mobility while using leg braces. This type of environment minimizes the risk of trips and falls by providing a direct, unobstructed route for movement. For individuals who rely on mobility aids, such as leg braces, having a clear space allows for easier navigation and enables them to move with more confidence.

In contrast, cluttered paths with obstacles would present significant challenges and potential hazards, making it difficult for Opal to maintain her balance or navigate effectively. Low furniture may also pose an issue, as it could create barriers that complicate movement rather than aid it. Similarly, while soft surface flooring can provide comfort, it may not necessarily promote mobility the way a clear pathway does, especially if it absorbs impact unevenly or leads to instability. Hence, the best choice to enhance Opal's mobility is indeed clear pathways.