Achondroplastic dwarfism is a hereditary condition, in which the long bones of the limbs fail to elongate normally because of reduced hyperplasia and hypertrophy of cartilage in the .

The correct answer is - epiphyseal plate.

Explanation:

Achondroplastic dwarfism is genetic disorder that occurs Due to the failing in elongation of the long bones of the limbs. This failing of the elongation takes place due to the reduced hyperplasia and hypertrophy of cartilage in the epiphyseal plate, that present at the end of long bones and produce the bone.

The epiphyseal plate is the site of growth of the bones for longitudinal growth by the hypertrophy, and proliferation of cell. Change or error in the gene cause the reduce hypertrophy and proliferation of the cell of cartilage in the epiphyseal plate that leads to the Achondroplastic dwarfism.

Thus, the correct answer is - epiphyseal plate.