Marriages in which either the husband or the wife has two or more spouses is called

A) polygamy.
B) polygyny.
C) polyandry.
D) monogamy.

Polygamy is the practice of having more than one spouse at the same time. It includes both polygyny, which is one man having multiple wives, and polyandry, which is one woman having multiple husbands. Therefore, A is the correct choice because it encompasses both forms of polygamy.