Government of laws and stuff
For example Mrs. Bennett claims Mr.bennet has no regard for her Nerves when in reality he claims that he is well aware of her Nerves meaning that he agrees she is crazy
Option A will only work if the sentence was "Each size of a pallet is approximately as large as the size of a refrigerator..."
pot·pour·ri
/ˌpōpəˈrē/
noun
a mixture of dried petals and spices placed in a bowl or small sack to perfume clothing or a room.
a mixture of things, especially a musical or literary medley.
Therefore, the phrase "a beautiful potpourri..." or mixture "...of differences" means that whatever this line is referring to is a pleasant mixture of many different things.
Hope this helped.