Answer:
A positive correlation
Explanation:
A positive correlation means that two entities are directly proportional to each other. If the value of one increases, the value of the second also increases. Similarly, if the value of one deceases, the other one also decreases.
There is a positive correlation between the two things - heart rate and daily intake of caffeine.
When caffeine intake is high then the heart rate is also high.
Thus a positive correlation can be seen here.