The correct answer would be A.
Search up the definition of icon and A is the only one that is similar to it. :)
Answer:
it increase the size of population
Vicksburg was vital to a union, it's B
claiming land in the age of exploration was a big deal to Europe because England, Spain, and France were all fighting for the glory of owning the most property over seas. For those who wanted freedom from the Kings strict rules on religion and speech, this was a gateway for them to "claim land for England" but also a path to their own freedom.