**Core Concept**
The underlying statistical principle being tested involves the arrangement of data in a specific order to determine a particular parameter. This process is crucial for understanding the distribution and central tendency of the data. **Median** calculation is a key concept here.

**Why the Correct Answer is Right**
To calculate the **median**, quantities must be arranged in either ascending or descending order. This is because the median is the middle value in a dataset when it is ordered from smallest to largest. If there is an even number of observations, the median is the average of the two middle numbers. The arrangement of data is essential to find the exact middle value.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it refers to a parameter that does not necessarily require data to be in order.
**Option B:** Similarly, this option does not require ordering of data for its calculation.
**Option D:** This option also does not need data to be arranged in ascending or descending order.

**Clinical Pearl / High-Yield Fact**
A key point to remember is that the **median** is more useful than the **mean** when the data contains outliers, as it provides a better representation of the central tendency in such cases.

**Correct Answer:** C. Median