One husband and one wife, that is a single pair of couple in a marriage is calledOptionsgroup marriagemonogamypolygamypolygyny

Sure, let's break down the options to find the correct answer:

1. Group marriage: This refers to a marriage arrangement where multiple men and multiple women are all married to each other. This does not fit the description of a single pair of a husband and wife.

2. Monogamy: This is a marriage system where an individual has only one spouse at a time. This fits the description of a single pair of a husband and wife.

3. Polygamy: This is a marriage system where an individual has multiple spouses simultaneously. This does not fit the description of a single pair of a husband and wife.

4. Polygyny: This is a specific type of polygamy where a man has multiple wives simultaneously. This does not fit the description of a single pair of a husband and wife.

Based on the definitions, the correct answer is monogamy.