Among the given options, the correct answer is A) steam is condensed to water.
Explanation: A physical change is a process that alters the form of a substance but does not change its chemical composition. When steam condenses into water, it changes from a gaseous state to a liquid state. This change is reversible, meaning you can convert water back into steam through heating. In contrast, the other options involve chemical changes: option B (water decomposing by an electric current) breaks down water into hydrogen and oxygen, option C (iron rusting) changes iron chemically into iron oxide, and option D (burning paper) transforms it into ash and gases, which are irreversible changes.