Option D is correct because an 'aside' is a dramatic device that serves multiple purposes. According to the context, an aside allows a character to directly address the audience, which makes a direct link between the audience and the character. It also allows the character to convey an unspoken thought, which shows what the character thinks or feels. Additionally, since the character may speak explicitly to the audience whether in or out of character, it enables them to talk about the story. Therefore, (i), (ii), and (iii) are all valid uses of an aside.