**Core Concept**
A histogram is a graphical representation used to display continuous (quantitative) data, where the data is divided into ranges or bins, and the frequency or density of observations within each range is represented. This allows for the visualization of the distribution of the data and identification of patterns or trends.

**Why the Correct Answer is Right**
Histograms are particularly useful for representing continuous data, as they provide a clear visual representation of the distribution of the data. This is achieved by dividing the data into ranges or bins, and then representing the frequency or density of observations within each bin as a bar. The height of each bar corresponds to the frequency or density of the data within that bin. This allows for the identification of patterns or trends in the data, such as the presence of outliers, skewness, or multimodality.

**Why Each Wrong Option is Incorrect**
**Option A:** Bar diagrams are typically used to represent categorical data, where the x-axis represents the categories and the y-axis represents the frequency or proportion of each category. They are not suitable for representing continuous data.
**Option B:** Pie charts are circular graphs used to represent categorical data, where the size of each slice corresponds to the proportion of the whole. They are not suitable for representing continuous data.
**Option D:** Map diagrams are used to represent geographic data, such as the distribution of a disease or a population characteristic, over a specific area. They are not suitable for representing continuous data.

**Clinical Pearl / High-Yield Fact**
When representing continuous data, histograms are a more informative and visually appealing option than bar diagrams or pie charts. Additionally, histograms can be used to identify patterns or trends in the data, such as the presence of outliers or skewness.

**✓ Correct Answer: C. Histogram**