Which one of the following will turn blue litmus red?

Non-metallic oxides are created when non-metals react with oxygen gas. When these non-metallic oxides interact with water, acids are created. Acidic oxides are hence non-metal oxides. As a result, a non-metal oxide will cause red litmus to turn blue.In this case, the only non-metal oxide is sulphur dioxide. While metal oxides that are basic in nature include magnesium, zinc, and aluminium oxides.