Answer: d.To give him more room to crawl around
Step-by-step explanation:
Grete, was the primary carer for her brother, whom was Gregor, and wanted to make him more comfortable. Grete saw that her brother has begun moving around and was even climbing walls and enjoying his new body.
Therefore, Grete wanted to move the furniture out of Gregor's room so as to give him more room to crawl around. The correct option is D.