Final answer:
Mary's parents most likely have an authoritarian parenting style and would most likely make the statement, "Because I said so, that's why."
Step-by-step explanation:
According to Diana Baumrind's theory of parenting styles, Mary's parents most likely have an authoritarian parenting style. Authoritarian parents value obedience and conformity and are often strict, with little warmth and affection. They are likely to make the statement, "Because I said so, that's why," indicating their expectation of obedience from Mary.