We have that first of all, diabetes is positively correlated with obesity but in most cases obesity can lead to diabetes, not the inverse; so diabetes cannot be a reason for obesity. A greater variety of foods means that there are more meal choices that lead to a balanced diet and hence this cannot contribute either. The high cost of vegetables can be a factor but this is not the case in general and there are always alternatives to get nutrients. THe correct answer is the first one, overabundance of food; this leads to caloric intakes that are not balanced and people get more energy than they need/use. This energy is stored as fat and hence leads to obesity.