9)
Which of these choices displays both proper parallel structure and correct use of commas?
A) The editor told his writers to make sure they punctuate properly, to make sure they place quote marks around direct quotations, and to check the quality of their work.
B) The editor, told his writers to make sure they punctuate properly, to make sure they place quote marks around direct quotations, and to check the quality of their work.
C) The editor told his writers to make sure they punctuate properly, to make sure they place quote marks around direct quotations, and checking the quality of their work.
D) The editor told his writers to make sure they punctuate properly, the importance of placing quote marks around direct quotations, and to check the quality of their work.