The proper in-text citation is 'According to Rosenthal, Whitman’s live oak conveys the wilds of Louisiana (Rosenthal 73).' This follows MLA guidelines for citing with the author's last name and page number.
The accurate in-text citation among the options presented is: According to Rosenthal, Whitman’s live oak conveys the wilds of Louisiana (Rosenthal 73).
This format is typical for MLA style, where the author's last name and the page number from where the information is taken are included within parentheses after the quote or paraphrase.
When the author's name is already mentioned in the text, only the page number is required within the parentheses.