Which would be considered a secondary source about the assassination of abraham lincoln?

When using the scientific method, what should be the first step? a.) gathering information on the problem. b.) stating the problem. c.) analyzing and interpreting data.

Who ever answers first gets ! trade in the vedic age led to a.the rise of kingdoms because of the importance of controlling land and long-distance travel routes b.the building of an extensive system of roads because of the difficult terrain c.the creation of a large banking class because of the need to exchange different currencies d.the development of a centralized government that controlled the economic decisions of its people

The leader of the bolsheviks was tolstoy alexander lenin nicholas