A toggle bolt is best used for mounting a safety warning sign due to its ability to distribute weight across hollow walls. Other options, such as securing heavy machinery, require different types of anchors. Thus, the correct answer is B. Mounting a safety warning sign.
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A toggle bolt is best used for mounting objects to hollow walls, making it suitable for mounting a safety warning sign. Its design allows for load distribution and ease of installation in drywall applications. Other uses like securing machinery would require different types of anchors. ;