Fruits and vegetables are more prone to spoilage when it is stored. It is because rise in temperature and moisture promotes the growth of insects and microbes. Under optimum conditions, microbes perform the enzymatic activity and produce mycotoxin (aflatoxin) which is responsible for the spoilage of fruits and vegetables. To avoid the spoilage, such food items are stored in the cold storage, where the temperature is low. The decreased temperature is also responsible to cause the delay in ripening of such stored food. In this way, food cold storage helps in the storage of fruits and vegetables. So,the correct option is D.