Identify the sentence which contains a subordinating connection. (10 points) a After a brief stop at the rest area, we continued our drive on the interstate. b Although the stop was short, we were thankful for time to stretch our legs during a quick walk around the park. c The rest stop had an area for picnic tables, and we decided that next time we would bring a picnic lunch for our return trip. d As a result, we bought a cooler and made sandwiches for our trip back home.