Explanation:

- The passage discusses the relationship between humans and machines, emphasizing how dependent humans have become on machines.

- Option 1: "from" - Generally used to indicate a source or starting point. It doesn't fit the context here, as it implies a separation.

- Option 2: "upon" - This suggests reliance or dependence on something, which aligns well with how humans interact with machines. It implies constant attention and attendance.

- Option 3: "under" - Often indicates being controlled by or below something, which doesn't quite capture the notion of attending to machines' needs.

- Option 4: "into" - Suggests a transformation or movement inside something, which doesn't suit the context of attending to machines.

- Correct Answer: Option 2: "upon"