**Core Concept**
The main purpose of adding metallic oxides in ceramic is to alter the physical and chemical properties of the ceramic material, such as color, strength, and electrical conductivity. This is achieved through the process of doping, where the metallic oxides are incorporated into the ceramic matrix, creating a new material with unique characteristics.

**Why the Correct Answer is Right**
The addition of metallic oxides in ceramic serves several purposes. For example, titanium dioxide (TiO2) is added to create white ceramic, while cobalt oxide (CoO) is used to produce blue ceramic. The metallic oxides can also enhance the mechanical properties of the ceramic, such as its strength and durability. Additionally, some metallic oxides can introduce electrical conductivity to the ceramic, making it suitable for applications such as electronics and sensors.

**Why Each Wrong Option is Incorrect**
* **Option A:** This option is incorrect because it does not specify the purpose of adding metallic oxides in ceramic.
* **Option B:** This option is incorrect because it suggests that metallic oxides are added solely for aesthetic purposes, which is not the primary reason.
* **Option C:** This option is incorrect because it implies that metallic oxides are only used to create colored ceramic, which is not the only purpose.

**Clinical Pearl / High-Yield Fact**
A key point to remember is that the type and amount of metallic oxides added to ceramic can significantly affect its properties, making it essential to carefully select and control the doping process.

**Correct Answer: C. To alter the physical and chemical properties of the ceramic material.**