You are a doctor examining a bone sample taken from a patient with weak bones. You find that the canaliculi of the bones are very underdeveloped. Based on this finding, you diagnose that the patient's weak bones are most likely caused by
a. inability of the osteocytes to receive nutrients
b. lack of blood vessels in the compact bone
c. reduced bone marrow in the spongy bone
d. overactive osteoclasts