A study tested four LED bulb designs and recorded brightness (lumens) at two operating temperatures: Bulb I, 850 (cool), 720 (hot); II, 800, 790; III, 920, 600; IV, 780, 770. The team argued that for outdoor summer use, cool-temperature brightness rankings cannot be used to select the best bulb—heat stability matters more. The strongest support is ______
Which choice most logically completes the text using the data above?
- A
Bulb I's brightness of 850 at cool temp.
- Bcheck_circle
the rank reversal: Bulb III is brightest at cool temp (920) but worst at hot temp (600); Bulb IV's modest cool-temp output (780) holds nearly stable at hot temp (770).
- C
Bulb III's brightness of 920 at cool temp.
- D
the average across bulbs.
Explanation
"Cool-temp ranking cannot select the best for hot use" requires showing rank reversal across temperatures. Choice B captures this directly.