Please help! Which of the following was ruled to be unconstitutional in the citizens United Supreme Court case

A

Explanation:

The BCRA prohibits any person from knowingly soliciting, accepting or receiving a contribution or a donation from a foreign national in connection with a federal, state or local election, or made to a political party committee.

radioactive dating, also known as  radioisotope dating  is a process that in  estimating the approximate  age  of  rocks. these data can be analyzed from  the studies dealing with the  decay of the radioactive elements that are present in these rocks. in nature, there are a few types of materials or atoms which are quite unstable and they spontaneously decay or breakdown to form other kinds of atoms.

thurgood marshall

explanation: in 1954, thurgood marshall and a team of naacp attorneys won brown v. board of education of topeka, kansas. in this landmark decision, the supreme court held that segregation in public education violated the equal protection clause of the fourteenth amendment.