Which sentence uses a compound subject? a) social media is becoming both a bane and a benefit to both students and teachers in the classroom. b) although the test was nearly impossible to complete, professor flores claimed that nobody failed the exam. c) the novelist gave a big sigh of relief after she finished her fourth (and in her opinion--her best) novel. eliminate d) the large screen television and the state-of the-art sound system were the two biggest prizes on the game show.