Answer: D)not justifiable, because ice cream sales and shark attacks both rise during the summer.
Explanation:
Correlation: It indicates that there is relation between any two variablesor more than two variable.
Causation: It is a type of correlation where one variable if affects other variable directly.
Thus , Causation implies correlation.
But correlation does not imply causation.
Therefore, if there is a positive correlation between ice cream sales and shark attacks , then we can not say there is a causation as both are not linked directly.
Hence, the statement is not justifiable, because Ice cream sales and shark attacks both rise during the summer and both are not interlinked.