The term for restriction of individual to one spouse at a time is:

Monogamy

The correct answer is Option (1) → Monogamy

• Polygamy refers to the practice of having multiple spouses at the same time. It can be further differentiated into polygyny (one man with multiple wives) and polyandry (one woman with multiple husbands).
• Endogamy is the practice of marrying within a particular group, such as a caste or religion.
• Exogamy is the practice of marrying outside of a particular group.