Answer:
A. Certified Financial Planner
Step-by-step explanation:
Also known as an investment advisor, the financial planner is a multispecialist, responsible for guiding his clients to organize or restructure their financial lives according to their goals and needs, combining planning and investments. This professional can help people who are out of balance with their finances, people who don't know how to invest their equity or even work out a plan to keep the client's standard of living the same after retirement.
From this we can state that if Cynthia wishes to specialize in estate and retirement planning, the certification that is most suitable for her would be Certified Financial Planner.