The correct answer is C.
An introduction has to capture the reader's interest so that he continues reading the piece. It should be written in an easy, understandable style and it should be kept relatively short.
All strong introductions have three components: a hook, a transition sentence and a theses statement.
The hook is the place where you grab the reader's attention. It may be a controversial question, a bold fact or just a hypothesis. The transition tells how the hook relates to the topic of the text and then the introduction ends with a theses statement.