Answer:
C. His life before the change and how unhappy and unappreciated he
was
Explanation:
Gregor found out his true worth after he turned into a bug. He realised that he was only appreciated when he was still a man because of what people around him, his family and employer can get from him. When he became a bug he realised how unappreciated he was since he couldn't do anything useful for them anymore. HE HAD BECOME WORTHLESS