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:
3
Explanation:
Any controlled (1) experiment yields(2) specific findings that <u>HELP</u> (3) to clarify the confusion somewhat (4).
God of Thebes, lead thou the round.
Bacchus, shaker of the ground!
Let us end our revels here;
Lo! Creon our new lord draws near,
Crowned by this strange chance, our king.
What, I marvel, pondering?