The answer should be A. Reason being that, as the argument mentions, when plastic is recycled, a low grade of plastic is obtained. It also mentions the fact that no applications (products) have been found for the lower grade of plastic than the recycled plastic. It simply means that currently it is ...

I too will go with 'C'..because the new type of wheat does not require toasting, yeast won't be destroyed..and leavened bread could be made.

That was a good approach. Thanks!