Iwould like to inform you that your product is faulty. put simply, it doesn't properly work. if you wished to maintain a formal tone in this message, which choice would make the best next sentence? a) this causes me great vexation. b) you won't believe how angry i am! c) i don't want to hear about how this just a simple mistake, either. d) i've followed the directions, but still get nothing but a big headache.