81 下列腫瘤侵襲(Invasion)的四個階段，請自先而後排出順序：①腫瘤細胞移動(Migration of tumor cells) ②附著於基質(Attachment to matrix components)③腫瘤細胞相互脫離(Dettachment of tumor cells from each other) ④分解細胞外母質(Degradation of extracellular matrix) (A) ①②③④ (B) ④③①② (C) ②③①④ (D) ③②④①