The correct answer to complete the sentence is Option D.
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, specially the food safety people, say otherwise.
The first sentence itself speaks about the unrest that is waging an argument between two sections, i.e., the people who support GMO and the others who don’t. Of the many public outbursts regarding food safety and other norms, the one including GMO is the latest, which is mentioned in Option D
The other options, A, B and C, describe public, scientists and GMO’s competition and fights which is not described in the passage.