The correct answer to complete the sentence is Option B.
The passage mainly speaks about GMO (Genetically Modified Organisms), and its effects if consumed by humans. While one section of the people say that genetic techniques are helping the food industry, the others, especially people associated with food safety, say otherwise.
In the second sentence itself, it is mentioned that the GMOs are added to the food to keep the food protected from insects of herbicides, which is mentioned in Option B.
The other Options A, C and D are not mentioned even once in the paragraph, hence making them null in completing the sentence.