Correct Answer: Option 3 its long-term effects on humans are still being investigated.

Many people including scientists fear the probable negative effects of genetically modified crops. Since time cannot be rushed in the laboratories, the long-term effects cannot be studied. All should have to wait for years to pass to really see if there are such negative effects.

Option 1 and 2 are incorrect. If a certain genetically engineered crop would have higher production than the naturally occurring crops, then that would be an advantage because the efficiency of the crop production is higher. And also, if a genetically modified crop would be resistant from pests, then that would be an advantage, not a problem.

It has been proven that there are genetically modified crops that taste better than the previously existing crops. A flavor-enhancing gene could be added to the crop so it would taste better. For example, a new variety of tomato has been genetically modified (GM) to produce geraniol, a rose-smelling compound found in fruits and flowers. In a blind taste test, 60 percent of 37 testers preferred the flavor of the GM tomato over the farm-grown tomatoes.