Assuming you meant explanatory text and not exclamation text, the answer would be brackets. For example, say your quotation is "She wrote the book." If you are quoting this directly in a paper, you want your audience to know who "she" is. So, you use brackets, and write the following: "[J.K. Rowling] wrote the book." Hope this helps.
Answer:
D.
Explanation:
some researchers have suggested that young children and infants may be more blindly altruistic than older children and adults, because they don’t yet possess the ability to be discerning.
Answer:
can you comment the rest of the paragraph under this answer? i think you forgot it...