Write the next sentence in this paragraph:

How to make play dough
Mix the dry ingredients.
In a mixing bowl, combine the flour and salt until the mixture is evenly blended.
Adding a tablespoon of alum to the mixture will make the dough less palatable to a child, reducing the likelihood that the child will eat it.

Pick from:
(a). It also provides a chance for the dough to break down while it is rolling out to size, so you can continue to spread it around. If you have more flour, you can pulse it one final time until it is evenly distributed.;
(b). Alum causes the air bubbles in the dough to rise and increases the likelihood that the child's mouth will get sticky. Use the back of a spoon to stir until well blended.;
(c). The alum also works as a preservative to help slow down the growth of bacteria. It's non-toxic, but large amounts can cause stomach aches.;
(d). You can find alum in specialty health food stores. Its additives will counteract any preservatives you might be using when making the dough.;
(c).