Since older people left education earlier and earned more, our correlation is weakened.
A – Wrong
It would not have no effect. There would be some change in our graph since our correlation is weakened.
B – Wrong
The weakening of our correlation would not cause only part of the graph to change.
C – Wrong
The entire graph would not shift up for any reason as there has to be a point on 0%. This is to show wage proportions as compared to wages of 15 year olds.
D – Correct
Since our correlation is weakened, the gradient of the graph would be lower.