The option that is an informal definition of perky is "Perky is one of those adjectives that sounds like what it means: cheerful and lively. Language like this helps bring color and depth to a reading and makes it come alive." (Option A)
An informal definition is a definition that is colloquial or conversational in nature.
Thus, it is right to state that the option that is an informal definition of perky is (Option A)
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