Final answer:
A diversified investment portfolio is the best option for Yvonne to invest her inherited money for growth over time and to build a solid financial future, balancing risk and potential returns.
Step-by-step explanation:
For Yvonne, who has inherited some money and wishes to invest it for growth over time while building a solid financial future, a diversified investment portfolio would be the most appropriate choice.
This is because a diversified portfolio can balance the trade-off between risk and expected return, something very important when considering saving for old age.
Comparatively, a certificate of deposit (CD) offers a fixed return and low risk but might have lower growth potential than a diversified portfolio. Similarly, a high-yield savings account provides liquidity and safety, but with lower returns. While investing in individual stocks could potentially offer high returns, they also come with a higher risk profile, which may not be suitable for Yvonne's goal of a stable financial future.