It is better for the environment if as much of all packaging as possible is made from materials that are biodegradable in landfills. Therefore, it is always a change for the worse to replace packaging made from paper or cardboard with packaging made from plastics that are not biodegradable in landfills.
Which of the following, if true, constitutes the pest objection to the argument above
A．The paper and cardboard used in packaging are usually not biodegradable in landfills.
B．Some plastic used in packaging is biodegradable in landfills.
C．In many landfills, a significant proportion of space is taken up by materials other than discarded packaging materials.
D．It is impossible to avoid entirely the use of packaging materials that are not biodegradable in landfills.
E．(E) Sometimes, in packaging an item, plastics that are not biodegradable in landfills are combined with cardboard.