Actually, the answer is he noticed the flour and other ingredients lose their unique properties! I took this question on a test, and I went with answer A and it was actually wrong, so the correct one would be C!
Joshua saw the rising batter form the cake in the oven. What Joshua
observed was because of the<span> reaction of baking soda or baking
powder with the liquid in the batter: These ingredients react together
and cause air bubbles to form. Baking powder contains sodium hydrogen carbonate
that breaks down when heated, releasing carbon dioxide that helps cake mixtures
to rise during baking.</span>
