How many acres did settlers need to clear for cultivation, as mentioned in the text?

The correct amount of acres that settlers needed to clear for cultivation, as mentioned in the text, is 320 acres. This figure is often associated with land grants or homesteading practices, where the size of the land parcel was sufficient to enable agricultural production and support a family's needs. Clearing 320 acres would have been viewed as a substantial effort, reflecting both the challenges and opportunities of frontier life during the settlement period. This allowed settlers to grow enough crops to sustain themselves and, in many cases, to produce a surplus for sale or trade, which was essential for their economic stability.

While other options, such as 160, 480, or 640 acres, represent different historical land policies or might have been considered in other contexts, the 320-acre requirement is often highlighted in discussions about settler agriculture and land use during that era.