Two containers, X and Y, were each filled with the same quantity of dough mixture for bread-making. Yeast was added to the mixture in Y. Both containers were then kept in a warm place for two hours. The diagram shows how they looked after this period. Which substance made by the yeast is responsible for the difference between the dough in X and Y?
- Aalcohol
- Bcarbon dioxide
- Clactic acid
- Doxygen