To determine which supporting detail best supports the central idea of "At the Head of her class, and homeless," consider the main themes of resilience and determination in the face of adversity.
The detail that best supports this central idea is:
"I just know when I have a goal, I try not to let anything get in the way, she says."
This statement highlights the individual's determination to succeed despite her challenging circumstances, aligning directly with the central idea of being academically successful while experiencing homelessness.