Assertion (A)
"To give a text an author is to impose a limit on that text, to furnish it with a final signified, to close the writing."
This means that when we assign an author to a text, we restrict its interpretation by implying that there is a definitive meaning intended by the author. The text becomes "closed" in the sense that its meaning is fixed and determined by the author's intentions.
Reason (R)
"A text is made up of multiple meanings drawn from many sources, and this multiplicity is focused on the reader."
This suggests that a text does not have a single, fixed meaning but is instead composed of various interpretations that can be derived from different contexts, sources, and readers' perspectives. The emphasis here is on the reader's role in interpreting the text, rather than the author's.