Final answer:
The sentence in question is acceptable as it properly cites the original source following academic conventions by including a parenthetical citation and integrates the quotes into the student's own discussion.
Step-by-step explanation:
The sentence "Death is present throughout Sula, and its significance has to do with 'war and the longing for peace' and to 'freedom through the formal structure of the novel' (Reddy 29)." is classified as acceptable.
The author has correctly cited the source by including a parenthetical citation with the page number, which indicates that the ideas and quotes contained in the sentence are credited to the original author, preventing plagiarism. Furthermore, the quotes used are within the context of the student's own sentence, which discusses the themes of death in the literary work 'Sula'.