Multi-choice problem: Choose from the options at the end, and answer how do you do this: To make modelling peanut butter

Available options: (a). Model all kinds of treats using this quick modelling peanut butter. Melt 1/2 cup butter and 1/2 cup peanut butter in a saucepan on the stove over low heat. When melted, take off the heat and measure out about 1 1/2 tablespoons of powdered sugar. Sift the sugar into the peanut butter mixture. and stir with a spatula or wooden spoon--it will get very stiff.; (b). Model all kinds of treats using this quick modelling peanut butter. Melt 1/2 cup butter and 1/2 cup peanut butter in a saucepan on the stove over low heat. When melted, take off the heat and measure out about 1 1/2 cups of powdered sugar. Sift the sugar into the peanut butter mixture. and stir with a spatula or wooden spoon--it will get very stiff.;
(b).