Answer:
D. Monogamy.
Explanation:
Monogamy means to be in a relationship (in this case marriage) with only one partner at a time. (Or simply put, between two people).
The prefix "poly-", means many, and so it would be more than 2 people (in a partnership). This means that a person may have many wives or many husbands.
In turn, the prefix "mono-", means one, referring to a single other in this case.
Learn more about monogamy & polygamy, here:
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