Answer :
Punctuation is a set of marks that are used in printing and writing to break sentences and clauses and to aid in the comprehension of texts. Punctuation includes things like commas, periods and question marks.
Correct option is A.
After you get back from your trip, be sure to upload photos, check your mail, and water your plants. This sentence shows correct placement of commas and full stop. Punctuation is the practice, action or system of adding points or other small marks into texts in order to facilitate understanding.
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