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Which of the following numbers divide exactly into $\left(15+\sqrt{49}\right)$?

(A) $3$ (B) $4$ (C) $5$ (D) $7$ (E) $11$

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Source: CEMC, University of Waterloo, licensed CC-BY-NC-4.0. Statement reproduced verbatim; metadata (topic, difficulty, ordering) added by this project. Solutions are the publisher's, linked not copied.