10. Which of the following is the empirical formula of terephthalic acid, $\text{C}_8\text{H}_6\text{O}_4$?
(A) $\text{C}_4\text{H}_3\text{O}_2$
(B) $\text{C}_8\text{H}_3\text{O}_2$
(C) $\text{C}_4\text{H}_6\text{O}_4$
(D) $\text{C}_4\text{H}_6\text{O}_4$

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