Which of the following serves as an example of liquid conductors?

Liquid conductors are substances that can conduct electricity due to the presence of ions. In the case of option C, fluids in which ions are present, such as saltwater or electrolyte solutions, are good examples of liquid conductors. The presence of ions allows these fluids to carry an electric current effectively because the ions can move freely in the solution, facilitating the flow of electric charge.

On the other hand, pure water, while it can conduct some electricity, does so only to a very limited extent because it lacks significant ion content—making it a poor conductor. Mineral oils are generally nonpolar and do not contain ions; thus, they do not conduct electricity well. Air is an insulator in its normal state and does not conduct electricity; it requires a substantial voltage to become conductive, such as during a lightning strike. Therefore, the presence of ions in fluids is essential for them to qualify as effective liquid conductors, making option C the most accurate example.