5. what percentage of slaves came through charleston south
carolina?

I believe it was 10%

By 1860, there were 4 million slaves in the United States, and 400,000 of them -- 10 percent -- lived in South Carolina. African-Americans, enslaved and free, made up 57 percent of the state’s population. Charleston was the nation’s capital of the slave trade, the place where many of those enslaved people first landed in the New World.

The answer is option b and c.