Which is an advantage of genetic engineering?
a. lack of labeling of food products that have been genetically engineered
b. diminished opportunities for organic agriculture
c. lack of long-term studies on food safety and environmental impact
d. ability to add vitamin and mineral supplements to food

One of the advantages of genetic engineering is the ability to add vitamins and minerals supplements to food. The correct option is D. The other options given are disadvantages of genetic engineering. Apart from the advantages given here, genetic engineering has other merits, such as production of better agricultural products, increasing shelf life of products, elimination of diseases, etc.