(D) Both $CO_2$ and $SO_2$ turn lime water milky due to the formation of insoluble metal carbonates or sulfites.$Ca(OH)_2(aq) + CO_2(g) \to CaCO_3(s)

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$Both \ (B) \ \text{and} \ (C)$

(D) Both $CO_2$ and $SO_2$ turn lime water milky due to the formation of insoluble metal carbonates or sulfites.$Ca(OH)_2(aq) + CO_2(g) \to CaCO_3(s) \downarrow + H_2O(l)$$Ca(OH)_2(aq) + SO_2(g) \to CaSO_3(s) \downarrow + H_2O(l)$Therefore,the correct option is $(D)$.