Question

Which answer contains proper in-text MLA citation?
Whitman’s live oak growing all alone is a powerful metaphor, according to Rosenthal (72).

Whitman’s live oak growing all alone is a powerful metaphor, according to Rosenthal2.

Whitman’s live oak growing all alone is a powerful metaphor, according to Rosenthal.

Whitman’s live oak growing all alone is a powerful metaphor, according to Rosenthal (Rosenthal 72)
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Answer 1

....according to Rosenthal (72) 
is the correct in-text MLA citation.

When the author of the work cited is mentioned in the text, it is no longer needed to cite the author (usually the last name) within parentheses as in the last option.

The two middle options (2 and 3) do not have parentheses therefore are not conform to MLA in-text citation guidelines.

Answer 2

D.Whitman’s live oak growing all alone is a powerful metaphor, according to Rosenthal (Rosenthal 72)                                                           Hope this Helps ^_^