Which of the following is required for the increased production of oestrogen, progesterone, cortisol, prolactin and thyroxine etc. in the maternal blood? (i) Metabolic changes in the mother. (ii) Maintenance of pregnancy. (iii) Supporting the foetal growth. (iv) Destruction of Graafian follicle.

• A. (iii) and (iv)
• B. (i), (iv) and (v)
• C. (i), (ii) and (iii)
• D. All the four statements