Bio ethanol is denatured alcohol, also referred to as

The correct option is methylated spirit.

Bioethanol is a form of ethanol (ethyl alcohol) produced through the fermentation of biomass, such as agricultural crops and wood residues. In its pure form, ethanol is consumable and subject to high beverage taxes. To make it unfit for human consumption while preserving its industrial and fuel utility, it undergoes a process called denaturing.
During denaturation, small amounts of foul-tasting, toxic, or noxious additives are blended into the ethanol. One of the most common denaturants used is methanol (methyl alcohol). Because methanol is a primary additive in this mixture, the resulting denatured alcohol is widely referred to as methylated spirit.

Let us look at why the other options are incorrect:
1. Methylene: This is a divalent hydrocarbon radical (reactive intermediate) with the formula ${\mathrm{CH}}_2$, which is chemical and structurally completely different from denatured alcohol.
2. Ethylene: This is a gaseous hydrocarbon with the formula $C_2{H}_4$ containing a carbon-carbon double bond, used primarily in plastics manufacturing and plant ripening.
3. Ethylene glycol: This is a diol (an alcohol containing two hydroxyl groups) with the formula ${\mathrm{(CH}}_2{\mathrm{OH)}}_2$, commonly used as an automotive antifreeze rather than a fuel or general-purpose solvent.