Answer:
C. his need to hold on to his human memories
Step-by-step explanation:
After waking up only to find himself transformed into giant insect and deprived of every human contact, Gregor Samsa undergoes massive emotional and existential crisis.
His family is frightened by him, they avoid contact, he spends days alone in his room trapped in this huge insect body. He realizes that the only things that connects him to his previous human life are his memories and his possessions, which he now cherrishes and clings onto so very much.