"<span>c. to add interest, complications, and intrigue" is the best option from the list, since subplots add a level of complication that makes both the story and the characters more interesting. </span>
No this is not a complete sentence
Come my and the reason these words need to be capitals is because come is the first word in the sentence and because it starts a quotation. my because it is after a comma.you would capitalize and because it starts a quotation