Answer:
An ossification center forms in the fibrous connective tissue.
Explanation:
Intramembranous ossification is an important process of formation of bone from the fibrous membrane. This process occur during the the fetal development.
Mesenchyme stem cell in the meduallry cavity starts the process of intramembranous ossification. The important process during intramembranous ossification is the formation of ossification center in the fibrous connective tissue.
Thus, the correct answer is option (A).