Which statement is true about opinion polls?
a. they can officials gather useful feedback on specific issues, but they can also influence officials to focus too much on pleasing the public.
b. they can prevent officials from making any mistakes, but they can also nullify or cancel important legislation and necessary government programs.
c. they can force officials to be honest with the public, but they can also reveal individuals’ private financial information.
d. they can allow officials to avoid the hassle and expense of the election process, but they can also stifle public debate on important issues.

regarding the law, the 15th amendment was specifically designed thinking in the rights of black free men.

even though ratified on february 3, 1870, the promise of the 15th amendment would not be fully applied for a long time.poll taxes and literacy tests would allow southern states disenfranchise african americans. only in 1965 the voting rights for african americans would be actually able to vote in the south.

in 1965, president johnson signed the voting rights act, which aimed to overcome legal barriers that prevented african americans from voting as it was guaranteed by the 15th amendment to the u.s. constitution.