The answer should be B.
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Answer: A commonly accepted and encompassing definition of marriage is the following: a formal union and social and legal contract between two individuals that unites their lives legally, economically, and emotionally.
A cause for infection is pathogens entering the body. This is either to a disease that's being transferred from one being to another, or through toxins, wounds, and similar things. Most commonly, when fighting the infection, the body produces white blood cells to combat the infection, which in combination with medication usually defeats the infection.