Answer: The answer is (C) As the number of visitors to a park increases, the number of flowers in bloom at the park increases.
Step-by-step explanation: We are given four options out of which we are to select which relationship is likely ONLY a correlation and NOT one of causation.
Causation is defined as the determination of the cause or reason for some sort of phenomenon while a correlation is simply a recognised relationship between two things or events, but it does not imply causation.In cases of correlation, one thing or event predicts another.
So, in the options (A), (B) and (D), we can see both correlation and causation simultaneously, but in option (C), we can only see correlation, NOT causation.
Thus, the correct option is (C).