**Core Concept**
Intramembranous ossification is a process of bone formation where bones develop directly from mesenchyme cells within a membrane, without the presence of a cartilage template. Endochondral ossification, on the other hand, is a process where bones develop from a cartilage template, which is gradually replaced by bone tissue.

**Why the Correct Answer is Right**
Intramembranous ossification is the primary mechanism of bone formation in the flat bones of the skull, such as the frontal bone, parietal bone, and maxilla. Endochondral ossification, however, is the primary mechanism of bone formation in long bones, such as the femur, humerus, and tibia, as well as in the vertebrae. This is because the cartilage template provides a growth plate that allows for the longitudinal growth of these bones.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is likely to be incorrect because the correct answer is not specified, but we can assume that it is one of the options B, C, or D.
**Option B:** This option could potentially be incorrect, but it is not the only option that could be incorrect. We need to consider the other options as well.
**Option C:** This option could potentially be incorrect, but it is not the only option that could be incorrect. We need to consider the other options as well.
**Option D:** This option is likely to be one of the correct answers, but we need to consider the other options as well.

**Clinical Pearl / High-Yield Fact**
It's essential to remember that the primary mechanism of bone formation differs between flat bones and long bones. Intramembranous ossification is responsible for the development of flat bones, while endochondral ossification is responsible for the development of long bones.

**Correct Answer: C.