Which of the following is an unbiased question? which do you prefer, a nice, luxury audi or a basic ford? would you rather take a vacation to the mountains or to the ocean? which would you prefer, a chicken sandwich or a juicy, tasty burger? most people say they would prefer a new governor over the current one, what do you think?

Statements reasons 1. ab ? cd; ad ? bc 1. given 2. ac ? ac 2. reflexive property 3. ? adc ? ? cba 3. ? 4. ? dac ? ? bca; ? acd ? ? cab 4. cpctc 5. ? dac and ? bca are alt. int. ? s; ? acd and ? cab are alt. int. ? s 5. definition of alternate interior angles 6. ab ? cd; ad ? bc 6. converse of the alternate interior angles theorem 7. abcd is a parallelogram 7. definition of parallelogram what is the missing reason in step 3?