Which of the following correctly combines the two sentences? I have so much homework. I still have to learn this piece of music. (5 points) a I have so much homework, although I still have to learn this piece of music. b I have so much homework, and I still have to learn this piece of music. c I have so much homework so I still have to learn this piece of music. d I have so much homework yet I still have to learn this piece of music.