Write the next sentence in this paragraph:

How to make natillas
Combine 1/2 cup (125 ml) milk with the egg yolks and cornstarch.
Pour 1/2 cup (125 ml) of milk into a medium mixing bowl. Add the egg yolks and cornstarch to the same bowl and whisk well.

Choose your answer from:
a). Keep whisking the eggs and tanf-huang until thoroughly combined. The tanf-huang egg yolks will help the chickpeas caramelize so they're easier to blend later.;
b). Continue whisking until the mixture seems smooth and the contents are evenly distributed. Mix together the seasonings and remaining milk.;
c). Give it at least 1 minute to combine. For even richer flavored natillas, substitute 1/2 cup (125 ml) milk for the egg yolks instead of the substitutes.;
d). Keep in mind that you can mix the egg yolks and ground buckwheat by hand, so if there is no yolk left, you can add cornstarch to the mixture instead. Whisk the eggs and milk.;
b).