What was the effect of the 15th amendment?
a. it legalized the separate but equal doctrine.
b. it gave black men the right to vote.
c. it struck down the jim crow laws in the south.
d. it made former slaves citizens of the united states.

According to the article,"social credit" is question 3 options: an experiment to people talk on-line a farming experiment that hurt people under mao ze dong using someone else's data from the internet, to give or take away things such as the right to buy an airline ticket a credit you get in china for having friends in real life, and not just on social media