Arrange the Steps Involved in Maintaining the Calcium Balance in the Body

Arrange the steps involved in maintaining the calcium balance in the body in the order they occur. (Enter the number of each step in the proper sequence; do not use commas or spaces.)
A) Release of calcium
B) Activation of osteoblasts.
C) Activation of osteoclasts
D) Increased calcitonin level
E) Increased parathyroid hormone