Concept:Many English nouns ending in 's' are not plural; they are singular or uncountable. 'Mice' is an irregular plural form of 'mouse'.Explanation:Only 'mice' among the options is truly plural. 'News' appears plural but is uncountable and always takes a singular verb, e.g., "the news is interesting". 'Electronics' is a subject like mathematics, used as singular. 'Billiards' is a game name, also singular. While most plurals are formed by adding 's' or 'es', these words are exceptions. 'Mice' is the irregular plural of 'mouse', similar to 'lice' from 'louse'. So, the correct plural noun is 'mice'.Answer:Option C: mice