Read the following context and choose the best option to answer the question.
Context: These include nonfat dairy products or processed foods . Finally , there are foods that you should absolutely avoid . These include meat , margarine or other oil products , avocadoes , nuts , dairy products , olives , sugar and alcohol . You should also avoid products that are commercially prepared .
Question: Why should the recipient avoid commercially prepared products ?
Options: 
A. None of the above choices .
B. They tend to be a cheaper option .
C. They tend to have a low fat content .
D. They tend to consist of unhealthy ingredients .


D