This is a test of commonsense with single/multi-choices. Complete the next sentence:

How to make marbled chocolate caramel slice
Preheat the oven to 350f/180c.
Combine the butter, flour, and superfine sugar in a bowl with your hands.
Mix thoroughly until the mixture resembles as fine breadcrumbs and a crumbly " dough ".
Press the dough in a pre-greased or non-stick 13 " x9 " (23x33 cm) pan.

Options:
(a). Bake for about 8-12 minutes. Open the mixture and rub a bit of butter on the top.;
(b). Use the back of a spoon to smooth it evenly into the tin. Use fork prongs to prick all over and bake for 20 minutes.;
(c). This is where the marinate begins. Add the chocolate, milk and sugar mixture to the already softened dough.;
(d). Spoon a square of the mixture and knead for 15 to 30 seconds. Cut up the caramel dough into circles about one inch in diameter.;
The answer is:
(b).