Legislator: Relatively few people in this society object to allowing the potential use of gene...

Legislator: Relatively few people in this society object to allowing the potential use of gene replacement techniques to treat disease, but most react negatively to allowing the use of such techniques to enhance people's performance in competitive sports. A clear distinction should therefore be made between medical treatment and performance enhancement when regulations concerning gene replacement are being formulated, because otherwise__________,

Which of the following most logically completes the passage?