Final answer:
A correlation coefficient of 0 indicates that there is no relationship between two variables.
Step-by-step explanation:
A correlation coefficient indicates the strength and direction of the relationship between two variables. A coefficient of 0 means there is no relationship between the variables. Therefore, the answer is c. 0, indicating no correlation. A coefficient of -1.0 indicates a perfect negative relationship, and while -0.2 indicates a weak negative relationship, it still represents some level of correlation. A coefficient of 30 is not a valid value for a correlation coefficient, as correlation coefficients range between -1 and 1.