What can you infer from the fact that the supreme court can declare laws unconstitutional?

The Supreme Court of the United States is the highest court in the country.

The fact that the Supreme Court can declare laws unconstitutional shows that their duty is to interpret the law. They judge whether new laws fit with previous ones, and with the Constitution itself, which is above every other law.

answer; primary source information;

it should be d or b but i'm sure it's d