A study reported high-school graduation rates (%) over four decades: 1950, 50%; 1970, 76%; 1990, 84%; 2010, 89%. The researchers concluded that graduation gains were largest between 1950 and 1970. The strongest support is ______
Which choice most logically completes the text using the data above?
- A
the 1970 rate of 76%.
- B
the 1950 rate of 50%.
- Ccheck_circle
the 26-point gain from 1950 to 1970, larger than any other 20-year interval in the table.
- D
the 2010 rate of 89%.
Explanation
"Largest gains 1950-1970" requires comparing intervals. Choice B captures the 26-point 1950-1970 jump and notes it's the largest interval.