Consider the following research question research question: why is yeast used to bake bread? which hypothesis is based on this research question? a. some people try to lose weight by cutting bread out of their diet. b. yeast added to bread dough produces a gas, and this causes the dough to rise, making the finished bread look like a sponge. c. yeast is a living organism. d. a comparison of rye bread to wheat bread indicates that rye bread is more enjoyable to eat.