Which of the following sentences is acompound  sentence?                 a.  the line was significantly shorter than usual which was a relief.      b.  both the barista and the cashier gave me a huge, welcoming smile.      c.  the coffee shop was usually full, but today there were many open tables.      d.  although i was in a hurry, i still 

He united states can produce 200 pillows in one week, while spain and france produce 150 and 100 pillows, respectively, in one week. on the other hand, spain can produce 10 televisions in one week, while the united states and france produce only 5 and 4 televisions, respectively. has an absolute advantage in producing pillows, and has an absolute advantage in producing televisions.