Final answer:
The correct balanced equation for the combustion of ethanol in air is Option A: C2H5OH + 3O2 --> 2CO2 + 3H2O.
Step-by-step explanation:
Option A is the correct balanced equation for the combustion of ethanol in air:
C2H5OH + 3O2 → 2CO2 + 3H2O
In this reaction, ethanol (C2H5OH) reacts with oxygen (O2) to produce carbon dioxide (CO2) and water (H2O). The balanced equation ensures that there is an equal number of atoms on both sides of the reaction.