**Core Concept**
A histogram is a graphical representation used to display the distribution of continuous data. It is a type of bar chart that shows the frequency or density of data within a range or bin, providing a visual representation of the data's distribution.

**Why the Correct Answer is Right**
A histogram is specifically designed to display continuous data, such as heights, weights, or ages. It helps to visualize the distribution of the data, including the shape, central tendency, and variability. The width of the bars in a histogram represents the range of values within a bin, while the height of the bars represents the frequency or density of the data within that range. This allows for easy identification of patterns, such as skewness or outliers, in the data.

**Why Each Wrong Option is Incorrect**
**Option A:** A bar diagram is typically used to compare categorical data between groups, not to display continuous data.
**Option B:** A pie chart is used to show the proportion of different categories within a dataset, but it is not suitable for displaying continuous data.
**Option D:** A map diagram is used to display geographic data, such as the distribution of diseases or health services, but it is not typically used to represent continuous data.

**Clinical Pearl / High-Yield Fact**
When choosing a graphical representation for data, consider the type of data being presented. Continuous data, such as heights or weights, is best represented using a histogram, while categorical data, such as disease prevalence or demographic characteristics, is best represented using a bar diagram or pie chart.

**✓ Correct Answer: C. Histogram**