Option A. When the introduction is not a complete sentence.
What is Punctuation?
Punctuation (or every now and then interpunction) is the usage of spacing, traditional symptoms (referred to as punctuation marks), and certain typographical gadgets as aids to the understanding and correct reading of the written text, whether read silently or aloud. Some other description is, "it is the exercise, action, or device of placing factors or different small marks into texts a good way to useful resource interpretation; division of the text into sentences, clauses, etc., by way of such marks."
In written English, punctuation is vital to disambiguate the meaning of sentences. for example: "woman, without her man, is not anything" (emphasizing the significance of fellows to women), and "woman: without her, the guy is not anything" (emphasizing the importance of women to men) have very one-of-a-kind meanings; as do "eats shoots and leaves" (which means the issue consumes plant growths) and "eats, shoots, and leaves" (this means that the difficulty eats first, then fires a weapon, and then leaves the scene).
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