Answer: B

Stock funds refer to funds that mainly invest in stocks. According to the classification standard of fund categories by China Securities Regulatory Commission, stock funds are those with more than 8% of fund assets invested in stocks. If more than 8% of the fund assets are invested in other fund shares, it is a fund in the fund. Bond funds mainly invest in bonds. According to the classification standards of China Securities Regulatory Commission for fund categories, bond funds have more than 8% of fund assets invested in bonds. Money market funds only invest in money market instruments.