94. p53 主要在下列何種致癌機轉中扮演重要的角色? (A)致癌基因活化(activation of growth-promoting oncogenes) (B)抑癌基因的壓抑 (inactivation of cancer suppressor genes) (C)調控細胞凋亡機制改變(alteration of gene that regulate apoptosis) (D) DNA 修補基因(repair gene)喪失