Let's determine the type of association we would see between the amount of fog in the sky and the distance the pilot can see.
Fog is a visible droplet that consist of tiny water droplets or ice cystals in the air. Fog is visible, so it has the tendency to reduce the distance a pilot can see.
In the sky, as the amount of fog in the sky increase, the distance a pilot can see decreases. This is because as the fog increase it covers the pilot's visibility which in turn reduces the distance a pilot can see.
Since one variable increases as the other variable decreases, the type of association we have here is a Negative association.
Therefore, the type of association you would expect to see between the amount of fog in the sky and the distance a pilot can see is a negative association.
ANSWER:
B. Negative association