The given figure shows feedback relationship between three glands and their hormones. The secretion of ?b? is decreased by 'a', secretion of 'c' is increased by 'b' while the secretion of 'a' is decreased by 'c'. Increased or decreased amounts of a hormone cause an increase or decrease in the amount of the following hormone in the system. Now if 'a' is added to the system, the secretion of 'c' is

• A. Decreased
• B. Increased
• C. First decreased and then increased
• D. First increased and then decreased