**Core Concept**
The question tests the understanding of dental anatomy and restoration, specifically the geometry of a mesio-disto-occlusal (MDO) amalgam restoration. In dental terminology, **point angles** and **line angles** are crucial for describing the shape and margins of dental restorations.

**Why the Correct Answer is Right**
A mesio-disto-occlusal restoration involves preparing a tooth for a filling that covers the mesial (side towards the midline of the jaw), distal (side away from the midline), and occlusal (chewing) surfaces. This preparation would typically result in specific numbers of **point angles** (where three surfaces meet) and **line angles** (where two surfaces meet).

**Why Each Wrong Option is Incorrect**
**Option A:** This choice is incorrect because it does not accurately reflect the geometry of an MDO preparation.
**Option B:** Similarly, this option does not correctly account for the number of point and line angles in such a preparation.
**Option C:** This choice is also incorrect as it misrepresents the geometric configuration of an MDO restoration.

**Clinical Pearl / High-Yield Fact**
It's essential to remember that the number of **point angles** and **line angles** can vary depending on the type of dental restoration. For an MDO preparation, there are typically 6 **line angles** and 3 **point angles** where the mesial, distal, and occlusal surfaces meet.

**Correct Answer:** C. 6 line angles and 3 point angles