I think that it would be if someone (or the author) uses a metaphor or a simile.
The correct answer would be B "Please put my letter in that mailbox." because a demonstrative adjective that refers to something far away would use words like that and those. But seeing as mailbox is not plural, that answer C would not make sense.
Bicentennial. Bi = 2, cent = hundred. ==> two hundred years.
I would say the answer is neither.. Hope I helped a little....
The answer is: states
The Constitution states,”The powers not delegated to the United States by the Constitution, nor prohibited by it to the States, are reserved to the States respectively, or the people.”
