Which Statement Is Incorrect

Which statement is incorrect?

A) PTH causes an increase in plasma calcium by activation of osteoclasts.
B) PTH increases renal reabsorption of calcium.
C) Vitamin D causes an increase in Ca₂₊ secretion into the lumen of the digestive tract.
D) Calcitonin causes a decrease in plasma calcium by decreasing Ca₂₊ movement from the bone fluid into the plasma and by suppressing bone resorption.
E) When plasma calcium increases, PTH decreases and calcitonin increases.