What is the most logical next event?

How to make bolillos
Proof the yeast.
Place 1/2 cup (125 ml) of warm water into a large bowl and add the yeast and sugar, stirring gently to mix the ingredients evenly. Allow the mixture to sit for 5 to 10 minutes, or until foam starts developing on the surface.

Possible answers:
(A). If the yeast mixture does not become foamy, that means the yeast is dead or will otherwise not activate. As a result, the bread will not rise if you continue forward from here.;
(B). Ensure that you are using ground fresh yeast, which should be readily available at most grocery stores or online. When the yeast is properly mixed, the foamy texture will begin to gently ooze out of the bottom of the bowl.;
(C). Carefully dip a piece of cheesecloth into the mixture and test. To check, squeeze the cheesecloth into a hole on the underside of the cloth.;
(D). According to the instructions on the package, you may need to refine the flour to 1/2 inch (1.25 cm). In other words, less flour is good than 1/2 inch (1.25 cm).;
(A).