Read the paragraph. [1] At the bakery, one loaf begins as a small bowl of starter. [2] The baker feeds the starter with flour and water each morning. [3] After it bubbles, the starter is mixed into the dough. [4] The finished bread has a tangy flavor and a chewy crust. Suppose the writer wants to include the sentence "Those bubbles show that the yeast is alive and ready to work." Where would it fit best in the paragraph?