Option c belongs to the relevant expenses of the fund, not the income of the fund. In addition to options A, B and D, the income of securities investment funds also includes the deposit interest income of fund assets.

The income level of securities investment funds depends on the ability of fund managers to manage and use fund assets. Generally speaking, the income mainly comes from the following aspects: (1) the bid-ask spread of securities, also known as capital gains. (2) dividend income, that is, the net profit distribution income enjoyed by holding stocks. (3) Bond interest, that is, the regular interest income obtained from the fund's investment in bonds. (4) Interest income from deposits, that is, interest income from bank deposits of fund assets.