The appropriate answer is C. The availability of processed foods. A balanced diet dictates that one consumes food from the six food groups in the correct proportions. Processed foods are those which have been preserved and they are not in their true, fresh from. Processing can include, canning, smoking, salting or curing and includes added preservatives.
Processed foods are often times more readily available than fresh foods and so more people will go for processed over fresh produces. Sometimes fresh foods are more expensive than their processed counterparts.