A researcher finds a will that names a man's 'son-in-law, John Smith.' In 19th-century U.S. usage, this term most likely means:
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A
John Smith married the testator's daughter
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B
John Smith is the testator's stepson
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C
John Smith is the husband of the testator's niece
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D
Either a son-in-law or a stepson, since the term was used for both