Why should oil or grease never be used to lubricate oxygen or acetylene regulators? a: it can react with certain chemicals or materials and result in an explosion b: it decreases the accuracy of the gauges c: it can result in valve damage due to corrosion d: it will result in the loose of the manufacturer's warranty

a: it can react with certain chemicals or materials and result in an explosion.

Explanation:

The main purpose of oxygen and acetylene regulators is to reduce the pressure and control the flow of gases from oxygen and acetylene cylinders. This is because such cylinders are generally held at pressures that are too high for oxyacetylene welding. However, it is important to never use oil or grease to lubricate oxygen or acetylene regulators, as these can react with certain chemicals or materials and result in an explosion.