The correct option is(3) hCG, hPL, progestogens, estrogens

Explanation:

The hormones secreted by the placenta to maintain Pregnancy are hCG, hPL, progestogens and estrogens. Placenta is the intimate connection between the foetus and uterine wall of the mother to exchange the materials. It has endocrine function and secretes the following hormones

(i) Human Chorionic Gonadotropins (hCG) It stimulates and maintains the corpus luteum to secrete progesterone until the end of Pregnancy.

(ii) Human Placental Lactogen (hPL) It is also known as Human Chorionic Somatomam- motropin (HCS), it stimulates the growth of mammary glands during Pregnancy.

(iii) Progesterone and estrogen support foetal growth, maintain pregnancy, inhibit uterine contractions, etc.

On the other hand, the sources of other hormones are as follows

• Oxytocin Secreted by posterior lobe of pituitary gland during foetal ejection reflex.
• Glucocorticoid Secreted by adrenal gland of foetus to induce foetal ejection reflex.
• Relaxin Secreted by corpus Iuteum to increase the flexibility of pubis symphysis.
• Prolactin Secreted by anterior lobe of pituitary, helps in the secretion of milk.