Which of the following does NOT describe a role that calcitonin plays when blood

D- if you know the function of vitamin D then the question is easy. Vitamin D works alongside parathyroid hormone to maintain high calcium levels in blood opposed to the function of calcitonin. therefore calcitonin can't stimulate the function of vitamin D.

or you can think of it this way: Calcitonin decreases calcium levels in blood.
-The intestine absorbs materials from food and then sends it via blood to other organs like the liver. therefore limiting absorption of Ca in intestine decrease blood Ca level ---> A is omitted.
-Bone is primary storage place of Calcium in the human body since calcium from the bone's matrix; calcium is distributed between blood and bones, therefore limiting osteoclasts from functioning will prevent breaking of bones' matrix and thus keeps calcium in bones and not in blood, thus lowering Ca levels in blood ---> B is omitted.
-Kidneys function to filter out NON gaseous wastes from blood. but blood is delivered to the kidneys can still have some materials the body needs. if calcitonin prevents reabsorption of calcium in kidneys, thus is prevents Ca from getting back into blood blood and sends it out with wastes. hence Ca level in blood decreases--->C is omitted.
-D is the remaining answer