Free blacks in the United States: a. could testify in court and vote in most states but could carry firearms only with the approval of the local sheriff. b. sometimes became wealthy enough to own slaves. c. had the same rights as whites in the North but faced far more restrictions on their freedom in the South. d. made up nearly one-third of the African-American population in the South. e. tended to live in rural areas if they lived in the Lower South.

The option a is not correct as the statement which states that black could testify in court and vote in most states but carry firearms only with the approval of the local sheriff is wrong.
The option c is not correct as the they had no same rights as white in North.
The option d is also incorrect as they didn't not make up one-third of the African-American population in the South.
The option e is also incorrect as the they didn't tend to live in rural areas if they lived in the lower South.
The option b is only correct as the free blacks in the United States became so much wealthy so they can get someone as a slave.