1) Despite the radical increase in the use of plastics over the last few decades, the mass of plastics at landfills stayed pretty much the same. Which statement explains this contradicting phenomenon?

a) The mass of plastic at landfills has not changed because there are less plastic products on the market.

b) The mass of plastic at landfills has not changed because the population is increasing.

c) The mass of plastic at landfills has not changed because of light weighting, which reduces the mass of plastic in a container.