The process by which osteoblasts add layers to circumferential lamellae is question 6 options:

a. endochondral ossification.

b. intramembranous growth.

c. appositional growth.

d. epiphyseal ossification.

e. interstitial growth.

I believe the answer is c. appositional growth.

In appositional growth, there will be a new layer formed after the cell finish the previous layer. Endochondral ossification and intramembranous growth is the big classification of bone formation. Interstitial growth related to cartilage growth. E piphyseal ossification happens in both ends of long bones.