Single/multi-choice problem: Which of the following solutions is better for the following goal:
How To Make Creamy Mac N Cheese

Possible answers:
A). To make Creamy Mac N Cheese, cook your sauce over medium high heat until it begins to thicken and slightly bubble. Take care to not burn the bottom and sides.;
B). To make Creamy Mac N Cheese, cook your sauce over medium high heat until it begins to thin and comes to a rolling boil. Thoroughly burn the bottom and sides.;
A).