Mashaal Masha
Despite being cheap, versatile, and easy to produce, ________ they are made from nonrenewable petroleum, and most do not biodegrade in landfills.

Which choice completes the text so that it conforms to the conventions of Standard English?
Difficulty: Hard
A: 

there are two problems associated with commercial plastics:

B: 

two problems are associated with commercial plastics:

C: 

commercial plastics' two associated problems are that

D: 

commercial plastics have two associated problems:

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