Answer: Hello mate!
You are studying the relationship between levels of job stress and measures of job efficiency.
now, we want to describe a positive correlation.
A correlation between two quantities, A and B, is A = kB
where k is a constant.
If the correlation is positive, means that when A increases also increase B, and then k is a positive number.
This means that, in our case, when job stress increases, job efficiency also increases.
Then the right answer is A "As stress levels increase, job efficiency increases."