A researcher tracked average smartphone screen time (hours/day) for four teen subgroups: 13-year-olds, 4.2; 14-year-olds, 5.1; 15-year-olds, 6.4; 16-year-olds, 7.8. The researcher argued screen time increases steadily with teen age. The strongest support is ______
Which choice most logically completes the text using the data above?
- A
the 13-year-olds' 4.2 hours.
- B
the average across all groups.
- C
the 16-year-olds' 7.8 hours.
- Dcheck_circle
the monotonic rise from 4.2 to 7.8 hours across age groups.
Explanation
"Increases steadily with teen age" requires the monotonic rise. Choice B captures it.