The correct option is C). The author's purpose is to inform and the passage supports this purpose by asking a question that will be answered by the text in the following paragraphs.
Authors tend to use questions at the beginning of a text to engage readers and orient them about the information that the text will provide. The questions that the author presents in the first paragraph function as a starting point which allows the readers to know what the text is about. Moreover, they also work as 'trigger questions' that contribute to increase the reader's interest as they are questions that readers could have asked themselves at some point in their lives.