Which of the following is considered a cleaning agent?

The correct answer is that acids like lemon juice are considered a cleaning agent because they have natural properties that can effectively break down stains and grime. Lemon juice contains citric acid, which can help remove rust, lime scale, and other types of buildup on various surfaces. Its acidic nature allows it to act as a natural disinfectant and cleaner, making it a common choice for both culinary and cleaning purposes.

On the other hand, while furniture polish is used to enhance the shine and protection of wooden surfaces, it primarily acts as a finishing product rather than a cleaning agent. Hand soap is mainly designed for personal hygiene and may not have strong qualities for cleaning surfaces. Air fresheners are used to mask or eliminate odors instead of cleaning surfaces, as their primary function is to improve the scent of an area rather than remove dirt or stains.