According to the given excerpt, the above quotation is an example of option A: Colloquial language.
Colloquial language is defined as the language of technical reports. It Depends on the writing that colloquial language are not appropriate for academic writing.
Moreover, this type of language is generally used in case of informal communication. Most probably idiom are used in conversation and other informal contexts.
In simple words we can say that it is implemented in case of features of familiar and informal conversation.
Therefore, correct option is A.
Learn more about Colloquial language, refer to the link:
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