C: It shows how people's reliance on smartphones allows for data to be collected about them.
Explanation:
People generally do not willingly give information out so that their smartphone will be more reliant, which eliminates B. People expect their smartphone to be reliant at the start, which allows many sensors to collect data on them. D is not true at all, as invasive apps were never mentioned. A is also false because it never talked about what specific information it collected. Paragraphs 1-4 are mostly about people's reliance on their smartphones, making the answer C.
