They are fat molecules that have no double bonds between carbon. Because they are saturated with hydrogen.
hope that helps.
The answer to this question is Personal taste.
As every one has his or her own love for food and a difference in their taste they would obviously take the most time in selecting a dish or the ingredients to prepare a dish that suits their taste buds.
Whether those ingredients are a little far away they will go and buy them so that the food they eat should please them.
A and B probably take the longest
