Researchers compared four insulating materials and recorded R-value (insulation rating, higher = better) and weight (g/m²): Material A, R=4.2, weight 320; B, R=5.1, weight 280; C, R=6.3, weight 245; D, R=7.5, weight 210. The team argued that for ceiling applications, lighter materials in this sample also have higher R-values, defying the typical assumption. The strongest support is ______
Which choice most logically completes the text using the data above?
- A
the average R-value.
- B
Material A's R-value of 4.2.
- Ccheck_circle
the inverse pattern: as weight drops from 320 to 210 g/m² across A to D, R-value rises from 4.2 to 7.5.
- D
Material D's weight of 210.
Explanation
"Lighter materials have higher R-values" requires inverse movement of weight and R-value. Choice B captures this monotonic inverse pattern.