Slavery arose from a necessity for labor and people to do it other than themselves since slave owners saw themselves as a sort of savior. Option (a) is the correct answer, that is racism.
Slavery became more necessary and desirable as a result of racism.
Racism provided white men with a pretext to claim superiority over African Americans by enslaving them and forcing them to labor for them.
Acceptance of slavery, some proponents of the Atlantic slave trade argued that slavery was the appropriate place for individuals of African origin, has often devolved into racism to excuse the enslavement of certain population groups.
As a result, enlightenment, capitalism, communism would have not helped the acceptance of slavery. Therefore, Option (a) helped.
For more information about slavery, refer below
https://brainly.com/question/365157