A GRE Issue essay has this thesis: Environmental laws are necessary, but voluntary norms and well-designed incentives can also make sustainable choices easier and more widely accepted. It responds to the prompt: People will protect the environment only if laws force them to do so. The prior paragraph did this: The previous paragraph argued that enforceable standards prevent free riding. The next body paragraph should introduce the role of norms and incentives alongside law; afterward, the essay will The essay will next discuss default options, pricing, and public habits.. Which topic sentence best creates cohesion?