The correct option about Gustavo's concern, taking into account the given information in the text in Spanish is: filthy conditions.
Summary of the Text
In the Spanish text, it is said that Gustavo's uncle likes to take care of keeping both his animals and the water they drink clean, and it is implied that Gustavo works on the farm.
Therefore, the concern that Gustavo has, taking into account the interest of his uncle, is the filthy conditions that can constantly be seen on a farm and which he must take care of.
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