Answer:
The answer is <u><em>C.) Le importa</em></u>
Explanation:
Let's go over the answer choices.
A.) A mi hermano les importa el medioambiente. This sentence does not make sense in Spanish. Therefore, it is incorrect.
B.) A mi hermano le importan el medioambiente. This sentence doesn't make sense in Spanish either. Therefore, this one is incorrect as well.
C.) A mi hermano <u><em>le importa</em></u> el medioambiente. This sentence does make sense in Spanish! Therefore, option C is correct.
Spanish is my second BEST language!
Hope I could help.
- <u><em>7272033Alt</em></u>