What is one word for ‘custom of having many wives’?

Correct option is C

The correct answer is option (c) – Polygamy.
Polygamy – A system of marriage involving multiple spouses.
• Hindi: बहुपत्नीत्व
Meanings of all the given options:
(a) Monogamy: The practice of having only one spouse.
• Hindi: एक विवाह प्रथा – गलत
(b) Bigamy: The crime of marrying a second person while already married.
• Hindi: द्विविवाह – गलत
(c) Polygamy: Custom of having more than one wife.
• Hindi: बहुपत्नीत्व – सही उत्तर
(d) Matrimony: The state of being married.
• Hindi: विवाह – सामान्य शब्द, गलत