Which of the following is an example of an informal definition

Answer:
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.
The one that exemplifies an informal definition would be as follows:
C). Sara McGregor, Senior Brand Manager, says that association ads are less likely to persuade millennial consumers because this segment tends to be wary of celebrity endorsements.
The term 'informal' denotes 'anything that is stated casually or reflects one's personal belief or opinions about something instead of being factual.'
The third statement exemplifies an informal definition because it involves the personal opinion of the brand manager which could be biased and in formal terms, it requires evidence to back the idea/claim.
Thus, option C is the correct answer.
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