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Two quantities are proportional if all ratios that relate the quantities are equal.
A
| x | 40 | 50 | 60 | 70 |
|---|---|---|---|---|
| y | 8 | 10 | 12 | 14 |
| y/x | 8/40=1/5 | 10/50=1/5 | 12/60=1/5 | 14/70=1/5 |
Because the ratios are the same between each pair of quantities, we know that the relationship is proportional and the constant of proportionality yx equals 15. Therefore, the correct answer is A.