Answer:
The details about families leaving for a better life inform readers about the status of the author’s family.
Step-by-step explanation:
This is the sentence that best explains how the details in the passage support the author's purpose. In this excerpt, the author wants to inform readers about the status of his family. Therefore, in order to do so, the author tells us about the abolition of slavery in the British Empire, the need for reliable workers in sugar plantations and the risks involved in leaving India. The author also tells us how, even though leaving India was very risky and scary, it was the right decision for some families, such as his.