The answer is: b. States have intangible boundaries.
A state boundaries is considered to be 'intangible' if they do not possess a physical form that clearly separate one area with the other. Currently, the most states in united states have a physical structure or natural objects (such as forests or mountain) that they use as a sign that separate their territories.
The question is asking for some kind of memory, so let's think what kinds of memory are there?
One way to divide memory is into long-term and short-term, and short-term memory describes a small number of recently perceived items. Short term memory is the correct answer here- and if she does not rehearse those words, they won't be passed to her long-term memory.
Here are the three main differences:
I think it is D i might be wrong don't know
