What happens next in this paragraph?

How to make an easy sponge cake
Have the ingredients ready.
Before you start, have everything ready. Sponge cakes are time sensitive cakes, so you don't want to measure ingredients or wait on the oven to heat while you're in the middle of mixing.
Pick your answer from: a). Measure all the ingredients and have them nearby before you begin. Sift the baking powder into the flour before you begin.; b). Preheat your oven to 375 degrees fahrenheit (190 degrees celsius). Note that the cake batter should be about 10 oz (100 g) thick and slightly grease-packed.; c). Another helpful idea is to assemble all the ingredients you'll need to make this cake. Much of what you'll need to make this cake doesn't always come on the package.; d). You can make the recipe by taking some food coloring with a little powdered sugar. Wet a sponge cake pan with the powdered sugar.;
a).