Simon, you _______ do your homework today. Leave it for tomorrow. [ ]

A. needn't to

B. not need to

C. don't need

D. don't need to

商品：是指用来交换的劳动产品。 根据上述定义，下列属于商品的是：

A．高山、流水、阳光

B．自给自足的农作物

C．买来的日用品

D．商店里卖不出去的发霉的面包