When working with additional information in a sentence, when should dashes be used instead of commas or parentheses?
a.
a dash is always used when renaming a noun.
b.
a dash is used to continue the flow of a complex sentence.
c.
a dash is used to set off a relatively important aside in a way that grabs the reader's attention.
d.
a dash is used in formal writing to set off less important background information.