Answer:
A Cash Crop
Explanation:
A cash crop or profit crop is an agricultural crop which is grown to sell for profit. It is typically purchased by parties separate from a farm. The term is used to differentiate marketed crops from subsistence crops, which are those fed to the producer's own livestock or grown as food for the producer's family. In earlier times cash crops were usually only a small (but vital) part of a farm's total yield, while today, especially in developed countries, almost all crops are mainly grown for revenue.
The correct option is C) Slavery was an established institution until the Twelfth Amendment was ratified on December 18, 1865.
This option is actually wrong since the twelfth amendment actually provides the procedure to elect the President and Vice President of the United States.
Other options in the question are true. Dr. Martin Luther King, Jr. DID give the famous "I Have a Dream" speech in 1963 which has now become ingrained in US culture.
Also, In 1870 the Fifteenth Amendment gave all male citizens the right to vote. Before this amendment, not everyone really had the right to vote and it would be another 90 years until women got the right to vote.
D. Indians increased demands for independence.