**Core Concept**
A mode is a type of average used in statistics to describe the central tendency of a dataset. It represents the value that appears most frequently in the dataset. Unlike mean and median, which are unique values, a mode can have multiple values if there are multiple most frequent values in the dataset.

**Why the Correct Answer is Right**
The mode is the most frequently occurring value in a dataset. When two or more values occur with the same frequency and are more frequent than any other value, they are considered modes of the dataset. This can happen when there is no single most frequent value or when there are multiple values that share the highest frequency. For example, in a dataset of exam scores, if the scores 60, 70, and 80 each occur twice, while all other scores occur only once, then 60, 70, and 80 are all modes of the dataset.

**Why Each Wrong Option is Incorrect**
**Option A:** The mean is a type of average that is calculated by summing all the values in the dataset and dividing by the number of values. It can only have one value, as it is a single number that represents the average of the dataset.

**Option B:** The median is the middle value in a dataset when it is arranged in order. If the dataset has an even number of values, the median is the average of the two middle values. However, the median can only have one value, as it is a single number that represents the middle value of the dataset.

**Option D:** This option is incorrect because the mode can indeed have more than one value.

**Clinical Pearl / High-Yield Fact**
Remember that the mode is the most frequently occurring value in a dataset, and it can have multiple values if there are multiple most frequent values.

**✓ Correct Answer: C. Mode**