Question

1. What does it mean to say that a country’s land area is positively correlated with its population?

Answer 1

It is A I believe it the most sense

Answer 2

For 1.
Positive correlation means if you plot a country's population and land size on a graph. There would be a linear regression line that's sloping upwards. 

Since it's a scatterplot, there will be some that fall out of the line, but most of them should be on the line.

It's  (A)

For 2.
An outlier is a datapoint that's far, FAR away from the others, so it's (B)

For 3. (A), it's a single line-of-best fit that runs through the middle of the cluster of data points.