A 2019 survey asked 2,000 commuters in four cities about their primary mode of transportation. Results: in Portland, 32% biked; in Minneapolis, 18% biked; in Houston, 4% biked; in Phoenix, 6% biked. Researchers argued that bicycle commuting rates remain heavily concentrated in a few cities rather than being evenly distributed nationwide. To support this claim, they pointed to ______
Which choice most logically completes the text using the data above?
- A
the average rate across the four cities.
- B
Phoenix's slightly higher rate than Houston.
- Ccheck_circle
the eight-fold difference between Portland (32%) and Houston (4%).
- D
the fact that all four cities had some bike commuters.
Explanation
The claim is about uneven concentration. Choice B's eight-fold gap (32% vs. 4%) directly demonstrates that biking is concentrated in some cities and rare in others, supporting the "heavily concentrated" argument.