How does this show the importance of free thought? Help

Freedom of thought is the precursor and progenitor of—and thus is closely linked to—other liberties, including freedom of religion, freedom of speech, and freedom of expression.[1] Though freedom of thought is axiomatic for many other freedoms, they are in no way required for it to operate and exist. The conception of a freedom or a right does not guarantee its inclusion, legality, or protection via a philosophical caveat. It is a very important concept in the Western world and nearly all[citation needed] democratic constitutions protect these freedoms. For instance, the Bill of Rights contains the famous guarantee in the First Amendment that laws may not be made that interfere with religion "or prohibiting the free exercise thereof". U.S. Supreme Court Justice Benjamin Cardozo reasoned in Palko v. Connecticut

Explanation:

the answer would be choice c, cave paintings.