Final answer:
The mode, option c, indicates how many times every value in a distribution appears.
Step-by-step explanation:
In statistics, the measure that indicates how many times every value in a distribution appears is called the mode. The mode is the value that occurs most frequently in a dataset. It is the most appropriate measure of frequency or occurrence.
For example, let's say we have a dataset of test scores: 75, 85, 90, 85, 80, 90, 75, 75. The mode of this dataset is 75 because it appears three times, which is more than any other value.
Therefore, the correct option is c) Mode.