**Core Concept**
Standardization testing of waxes is crucial in various industries, including pharmaceuticals, cosmetics, and food, to ensure consistency in their melting points, hardness, and other physical properties. This process involves measuring the melting point of a wax sample to determine its purity and quality. The melting point is a critical parameter in the evaluation of waxes, as it affects their performance in various applications.

**Why the Correct Answer is Right**
The correct method for standardization testing of waxes is the capillary melting point apparatus. This apparatus consists of a capillary tube with a small diameter, which allows for precise measurement of the melting point. The wax sample is placed in the capillary tube and heated slowly, and the temperature at which the wax melts is recorded. This method is widely accepted and used in various industries due to its accuracy and reliability. The capillary melting point apparatus takes into account the thermal gradient and ensures that the wax melts uniformly, providing a reliable and repeatable result.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because the Ostwald viscometer is used for measuring the viscosity of liquids, not the melting point of waxes.
**Option B:** This option is incorrect because the Bunsen burner is a laboratory equipment used for heating and combustion reactions, not for standardization testing of waxes.
**Option C:** This option is incorrect because the Soxhlet apparatus is used for extraction of solids from liquids, not for standardization testing of waxes.

**Clinical Pearl / High-Yield Fact**
The melting point of a wax is a critical parameter in its evaluation, and it can be affected by the presence of impurities or additives. Therefore, it is essential to use a reliable and accurate method for standardization testing of waxes, such as the capillary melting point apparatus.

**Correct Answer:** C.