Select the correct option.

1. A
   $8^{th},9^{th}$ and $10^{th}$ pairs of ribs articulate directly with the sternum.
2. B
   $11^{th}$ and $12^{th}$ pairs of ribs are connected to the sternum with the help of hyaline cartilage.
3. C
   Each rib is a flat thin bone and all the ribs are connected dorsally to the thoracic vertebrae and ventrally to the sternum.
4. D
   There are seven pairs of vertebrosternal, three pairs of vertebrochondral and two pairs of vertebral ribs.