Answer: A. That old Spanish song
Explanation: Grammatically, the correct way to format this sentence would be to address the age-related term (old) before addressing the adjective (Spanish). Typically, the sentence would look like so:
"I like that old, Spanish song."
Choice B is incorrect in that it does not apply the standard conventions of English. Choice C also is incorrect for the aforementioned reason. Choice D is incorrect because it inverts the order in which the sentence should be worded.