Answer:
is one hundred percent sure
The correct answer should be something like: "Gene therapy involves the use of bacteria or viruses to deliver new or modified genes to cells". That is what can be concluded based on the paragraph you provided.
The correct answer is option B
The use of fossil fuel in harvesting of apples lies at the stage when the apples fall from the tree. When there lots of apple that has to fall from the tree and picked up for sorting. Monster machines are used for the shaking of trees vigorously so that lots of apple fall at a same time. This machine use fossil fuel for its working.