Answer: B. "Demand for cotton"
When conducting research on a topic, choosing the right keywords can influence the quality and amount of information that is available. In this case, Emma wants to learn about the growth of slavery in Texas. By thinking back to other regions, Emma remembers that cotton plantations were strongly linked with slavery. She might then research the demand for cotton in Texas to see if there is a connection between the demand for cotton and the rise in slavery.
