The most appropriate answer to why it was necessary in 1868 to apply the federal bill of rights to the states with the 14th Amendment is:
A. to establish civil rights for visible minorities.
The 14th Amendment was largely aimed at addressing the issues faced by formerly enslaved individuals and ensuring their civil rights. It sought to provide equal protection under the law and to prevent states from violating the rights granted by the federal Constitution. This reflection was particularly important in the context of post-Civil War America, where many states enacted laws that discriminated against African Americans and other minority groups.