Which of the following is an example of an informal definition

Option "C" is correct

Explanation:

Informal definition can be regarded as informal style used in writing or making speech that involves using casual as well as familiar words. This is usually involves colloquial use of language. It is often more direct compare with formal style. Using of abbreviations as well as short sentences, and contractions may be found in informal definition of words. It is usually contains more of casual and spontaneous words.