According to Albert Camus's ideas on absurdism, it is completely unnecessary to answer this question because the more you attempt to understand what happiness is, the less happy you will be.
The correct answer is A. Guests help themselves from a buffet table. This is however a changed version of the original French service which changed over the years. All of the food is presented at the same time and the people choose whatever they wish to eat.
A so they have time to make it perfect