I believe the answer is b. they must direct they government
They learned that they need to create more realistic art because they needed something modern.
If the Confederacy had made a plan similar to the Anaconda Plan, the capturing of Washington D.C. and controlling California. The only event that will not happen if the Confederacy made the same Anaconda plan would be blockading Boston and New York.
The answer is the third statement.
Diseases. To list some would be influenza, smallpox, etc.