Final answer:
Taking a personal finance class would contribute the most to Jenna's financial well-being by teaching her important skills such as budgeting, saving, investing, and understanding financial concepts like credit and debt.
Step-by-step explanation:
(A) Taking a personal finance class to learn how to manage her money would contribute the most to Jenna's financial well-being. This class would teach her important skills such as budgeting, saving, investing, and understanding financial concepts like credit and debt. By gaining this knowledge, Jenna would be better equipped to make informed financial decisions and improve her overall financial situation.