by bbirdwell Wed May 25, 2011 12:54 am
A couple of things come to mind.
The answer choice reads "value of land can be gauged from income of residents."
When I interpret this, I think, "If residents earn X dollars, land is worth about Y dollars."
This is not quite the same as what's mentioned in the text, which says: "Residents could earn more if they moved, therefore the land is valuable TO THEM."
In this instance, the value of the land has not really been gauged. More accurately, the residents' motivation for staying has been gauged. They stayed because the land is valuable to them, not, as (C) suggests, because the land is valued at Y based on their income of X.