Answer:
B- opened borders to all foreigners that wished to visit China.
The following scenario which would most likely cause the country's literacy rate to decrease would be if A) Libya is torn by civil war. This would cause the literacy rate to decline, because if there is civil war, schools are shut down and it is unsafe for children to go to school, so their education is halted. This ties into the literacy if schoolchildren have their daily reading and writing learning halted.
The 13th Amendment outlawed slavery
The 14th Amendment stated that no state shall abridge the rights of any citizens
The 15th Amendment, ostensibly, gives the right to vote to African-American men. It states that "The right of citizens of the United States to vote shall not be denied or abridged by the United States or by any State on account of race, color, or previous condition of servitude."
So, the 15th Amendment worked to codify, or bring into fruition, a whole new group of voting citizens who had equal protection under the law in a system where slavery is now illegal.
C, because why would we send people to moon just to test nukes?