Answer:
c. Osteoporosis
Explanation:
Osteoporosis -
It is the disease which weakens the bone and increases the chances of bone braking .
Osteoporosis is one of the most common reason for a broken bone during old age . The most common bone affected by this are the , spine , hip , forearm .
hence , from the question , Sarah is maintaining a good diet with high calcium concentration and working out , to maintain her bones and avoid the problem of Osteoporosis .