The main causes of Shays' Rebellion all had to do with anger of tax and debt collection, which showed that the early United States had a very hard time exerting power over the individual states and the populations of these states.
Every state was given equal representation in Congress.
The Industrial Revolution led to imperialism in Africa in the mid-1800s; the 1st Euro's to explore the interior of Africa were missionaries & explorers; reports of large deposits of natural resources & the rise of nationalism in Europe set off a race for African colonies. Europeans introduced new technologies like railroads, telegraph lines, & steamboats...but transportation routes only connected areas that benefited European businessman; Europeans brought an end to the slave trade but Africans were paid low wages & exploited. Europeans built schools, churches, & hospitals...but Africans were taught European culture; Europeans profited off Africa's raw materials & cheap African labor; Africans were unable to rule themselves, participate in voting, or learn professional skills
B is the closest answer to your question, so B is the answer :)