Explanation:

- Malinowski: He is a prominent anthropologist known for his functional analysis of family and marriage. However, he defined marriage mainly in the context of social legitimacy and not specifically as a contract for production and maintenance of children.

- Westermarck: He explained marriage as a legal relationship between a man and a woman, but his focus was on social and cultural aspects rather than a contract for child-rearing.

- Murdock: He defined marriage as “a social contract for the production and maintenance of children,” emphasizing the societal function of marriage related to offspring.

- Taylor: He was an evolutionist anthropologist, but he did not offer this specific definition.

- So, the correct answer is Option 3: Murdock.