Dependent clause, comma. Introductory clause, nonrestrictive/parenthetical element. Independent Clause. Clause

A. A clause that expresses a complete thought and can stand alone as a sentence

B. A dependent clause at the beginning of the sentence before the independent clause

C. A group of words that adds more information about a noun and can be removed without changing the meaning of the sentence

D. A clause that does not express a complete thought and can not stand along as a sentence
A group of words that contains a subject and a verb

F. a punctuation mark that sets off certain clauses and nonrestrictive/parenthetical elements

The correct answers are:

A. A clause that expresses a complete thought and can stand alone as a sentence
D. A clause that does not express a complete thought and can not stand along as a sentence
C. A group of words that adds more information about a noun and can be removed without changing the meaning of the sentence
F. a punctuation mark that sets off certain clauses and nonrestrictive/parenthetical elements

The correct options are:

A. A clause that expresses a complete thought and can stand alone as a sentence
D. A clause that does not express a complete thought and can not stand along as a sentence
C. A group of words that adds more information about a noun and can be removed without changing the meaning of the sentence
F. A punctuation mark that sets off certain clauses and nonrestrictive/parenthetical elements