Here are the reasons for selecting the correct statements:

A. Polygyny is the practice where a man has several wives. In polygyny, a man can be married to multiple women simultaneously.

B. Endogamy refers to the practice of marrying within a specific unit, caste, clan, or group. It involves marrying someone within one's own social or cultural group.

 C. Polyandry refers to the practice of a woman having several husbands, which is relatively rare in comparison to polygyny.

D. Exogamy is the practice of marrying someone outside one's social or cultural group. It can refer to marriage both inside and outside one's own group.

E. 'Kanyadana' is an important religious duty of the father in the context of Hindu marriage rituals. It involves the father giving away his daughter in marriage, and it's considered a significant cultural and religious practice.

So, the correct option is [1].