D: It proves to readers why they should disable the sensors on their smartphones.
Explanation:
Both A, B, and C are answers that have some truth to them. A is true in the sense that one could be getting charged more for what information they have about the user. B is true in the sense that it does emphasize how much information can be collected about you. C is true in the sense that companies are lying about what they do to get more information. However, D is the correct answer because it's putting a situation into a real-life perspective and proves to the readers why they need to be disabling the sensors on their smartphones. If they don't, they could get charged more by unethical companies who have information about them.
