When flammable or corrosive fumes are present, which of the following is NOT considered a hazardous material?

Anhydrous Citric Acid is considered the correct answer because it is generally not classified as a hazardous material in the same context as the other substances listed. While it can be an irritant in high concentrations, it is not typically recognized as flammable or corrosive like sulfuric acid, hydrochloric acid, and acetylene.

Sulfuric Acid and Hydrochloric Acid are strong acids that can cause severe burns and release harmful fumes, making them unequivocally hazardous. Acetylene is a flammable gas that can ignite readily and poses significant risks in a range of environments. In contrast, Anhydrous Citric Acid is utilized widely in the food industry and in various applications due to its relatively benign nature, rendering it less hazardous in comparison to the other chemicals involved.