Don't ____ to others like that. You should ____ politely. [ ]

A. say; speak

B. speak; tell

C. say; talk

D. talk; speak

已知如下结论：“等边三角形内任意一点到各边的距离之和等于此三角形的高”，将此结论拓展到空间中的正四面体（棱长都相等的三棱锥），可得出的正确结论是：______