TOEFL Listening: TPO-TOEFL阅读TPO - B9721R544Z29085YN$

Why are "beer, glass, soap, and other products" mentioned in the discussion of Britain's energy? A. To help explain why the energy crisis was so severe B. To show that despite the energy crisis and as early as 1640, London homes were advanced and well supplied C. To emphasize that after 1640, British homes required energy for more than heat D. To indicate that coal had been used for the production of certain products before the eighteenth century