An investor wants to purchase additional mutual fund shares with income distributed by the fund.

Step by Step Explanation:

Dividend Reinvestment Plans (DRIPs): These allow investors to automatically reinvest income distributed by the mutual fund to purchase additional shares.

Dollar Cost Averaging: Refers to systematic investments over time, not directly tied to income distributions.

Capital Gains Reinvestment: Involves reinvesting profits from the sale of fund holdings, which is distinct from dividend reinvestment.