Answer
A.Mutual funds
Explanation
Mutual funds offers professional management. The managers will do a research on Samantha's behalf and select the securities and monitor the performance.
Mutual funds facilities investments in a range of companies and industries. This lowers the risks.In addition to that,mutual funds are affordable. The funds set a low dollar amount for first investment and subsequent purchases. Moreover, when it comes to liquidity,She can easily redeem her shares anytime for current net asset value(NAV) and additional redemption fees.