求助 GWD3-41

The market for recycled commodities like aluminum and other metals remain strong despite economic changes in the recycling industry.

1. commodities like aluminum and other metals remain
2. commodities like those of aluminum and other metals are remaining
3. commodities such as aluminum and other metals remains
4. commodities, such as aluminum and other metals, remain
5. commodities, like the commodities of aluminum and other metals, remains

选E. 

不是有一说: like 不举例子, such as 举例子吗? 

这里C为什么不对?  铝和其他金属不就是商品吗?

请NN指教.    多谢!!

Lucy