The correct answer is "all of the above." In this part of the novella, Gregor undergoes three changes: he loves garbage, he is going blind, and he sleeps under the sofa. Additionally, he prefers garbage, he is getting weak, and he feels comfortable sleeping under the sofa. Finally, he is going blind, he changes from being proud to feeling guilty, and he prefers garbage. Therefore, all of these changes are true for Gregor in this part of the novella.