Irrelevant. There may be other ways to spread ideas, but spreading ideas was still the original purpose of copyright. (A) fails to address how copyright sometimes goes beyond that purpose.

Irrelevant. Even if some authors circulate ideas without copyright, it doesn’t change the fact that the original purpose of copyright was to further circulate ideas. (B) fails to address how copyright sometimes goes beyond that purpose.

Irrelevant. The original purpose of copyright was to promote the spread of ideas by allowing authors to earn financial rewards for their work. The fact that some authors can’t find publishers tells us nothing about how copyright sometimes goes beyond that purpose.

If copyrights are difficult to enforce, they may be unable to achieve their original purpose. But this doesn’t describe how copyrights sometimes go beyond their original purpose.

If an author is no longer alive, he can’t circulate ideas or earn financial rewards for his work. So, copyrights that hold after an author’s death are going beyond their original purpose.