Answer:
C- A person who wants to change the national anthem.
Step-by-step explanation:
This is because they want the anthem to be easier to sing, so they would likely want to change it to be easier. B is incorrect because to a person who doesnt care about the anthem, they would not care if it was easy or hard to sing. It is not A because someone who likes the anthem would not want it to be easier, they would like it the way it is. Finally, D is wrong because God bless America isnt even the National anthem. It just doesnt make sense.
I hope this helps!