30.國二的凱祥能從第三者的角色來看待他人與自己。根據賽爾門(R. Selman)的角色取替(perspective taking)觀點，凱祥正處於下列哪一個階段？ (A)主觀觀點取替階段(subjective perspective taking stage) (B)自我深思熟慮階段(self-reflective thinking stage) (C)相互觀點取替階段(mutual perspective taking stage) (D)深層與社會觀點取替階段(in-depth and sociated perspective taking stage)