All of the following stuff can help archaeologists to learn about contemporary society or ancient society except ______.

A．fresh garbage can't provide as much information as ancient garbage does
B．only the author himself can benefit most from refuse studies
C．the studies of the Garbage Project are much better than any other research into the behaviors of consumers
D．the Garbage Project mainly deals with newly discarded refuse

A．produces
B．manufactures
C．designs
D．assembles