Arrange the following factors in the order of their impact on social mobility, from the least to the most influential: A) Educational opportunities, B) Family background, C) Race and ethnicity, D) Personal motivation.

To understand social mobility, we can think about how different factors influence a person's ability to move up in society. Family background is often the most influential because it shapes a person's early life experiences, opportunities, and financial support. Next, educational opportunities play a crucial role since access to quality education can open doors for better jobs and higher income. Personal motivation is also important; if someone is determined and works hard, they can overcome many obstacles, but it usually works best when combined with good education and support. Lastly, race and ethnicity can affect social mobility, but the impact can vary greatly depending on the context and location, making it less universally influential than the other factors.