Digital SAT · Reading and Writing · Standard English Conventions. The idea in plain words, the rules to remember, the mistake to avoid and a worked example, written and checked by Mega Lecture.
These questions test punctuation. The words in the four options are almost the same; only the marks change. Start by finding the clauses. An independent clause has a subject and a verb and can stand alone as a sentence.
Two independent clauses must be joined properly: with a period, a semicolon, or a comma plus a joining word such as "and," "but" or "so." A comma alone is not enough.
Inside a sentence, extra information that could be lifted out needs a matching pair of marks around it: two commas or two dashes. Information that the sentence needs takes no marks. Never put a single mark between a subject and its verb.
Joining two complete sentences with only a comma. Test each side of the blank: if both can stand alone, you need a period, a semicolon, a colon, or a comma with "and," "but" or "so."
Answer: (B) tree,
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