The word "them" in the sentence is used as the indirect object. The correct answer would be option B. It is used as the indirect object because it is being affected by the verb used in the sentence. The subject or the doer of the action is "sandy", the verb is "showed" and the direct object is "her coin collection" making "them" as the indirect object.
First i believe its a "figure of speech".
Second they use this to say "it wont be easy but it is possible."
I would think D, because you have to stop and read conversations and stuff between characters which brings up more detail