Civil War and Reconstruction. 1861-1870.
The main countries to which the Irish emigrated during the famine were all anglo-saxon countries (so English speaking countries). These included England, Scotland, Wales, the United States, Canada and Australia. Liverpool, in north west England received a huge number of immigrants, as well as Quebec City and Toronto in Canada and Boston, New York City, Philadelphia and Baltimore in the United States.
I would think that A is the most applicable, but C could also work.
While the amendment provided legal protection for voting rights based on race, there were other means that could be used to block black citizens from voting. These included poll taxes and literacy tests. These methods were employed around the country to undermine the Civil War Amendments and set the stage for Jim Crow conditions and for the Civil Rights Movement.
