**Core Concept**
The question is testing the student's understanding of data measurement scales in statistics and research methodology. Specifically, it's asking them to identify the correct scale used for quantitative data, which refers to numerical data that can be measured and expressed with precision.

**Why the Correct Answer is Right**
Quantitative data is typically measured on a scale that allows for precise measurements, such as numerical values. The correct answer is the **Ratio Scale**, which is a level of measurement that has a true zero point and equal intervals between consecutive levels. This scale is used for quantitative data that can be expressed as a ratio, such as weight, height, and temperature. The ratio scale allows for mathematical operations like addition, subtraction, multiplication, and division, making it ideal for quantitative data analysis.

**Why Each Wrong Option is Incorrect**
* **Option A:** **Nominal Scale** is incorrect because it's a level of measurement that only labels variables without any quantitative value or order. Nominal scales are used for categorical data, such as gender, nationality, or blood type.
* **Option B:** **Ordinal Scale** is incorrect because it's a level of measurement that has a natural order or ranking, but the intervals between consecutive levels are not equal. Ordinal scales are used for data that can be ranked, such as satisfaction levels or educational qualifications.
* **Option C:** **Interval Scale** is incorrect because it's a level of measurement that has equal intervals between consecutive levels, but it lacks a true zero point. Interval scales are used for data that has a natural order, such as temperature or IQ scores.

**Clinical Pearl / High-Yield Fact**
When analyzing data, it's essential to understand the measurement scale used to ensure accurate interpretation and conclusions. Remember that quantitative data requires a scale that allows for mathematical operations, making the ratio scale the most suitable choice.

**Correct Answer: C. Ratio Scale**