大宗商品为什么不行？

问题如下：

An investor seeks a current income stream as a component of total return and desires an investment that historically has low correlation with other asset classes. The investment most likely to achieve the investor’s goals is:

选项：

A.Timberland. B.Collectibles. C.Commodities.

解释：

A is correct. Timberland offers an income stream based on the sale of timber products as a component of total return and has historically generated returns not highly correlated with other asset classes.