TOEFL Reading: ETS-TOEFL阅读机经 - 53JVPZ5D44EN237VL$

According to paragraph 5 why has Moscow generally been considered fortunate in its princes A. For a long period of time royal succession proceeded peacefully and without interruption from one generation to the next. B. Through most of Moscow's history royal nephews were unable to take power away from each other. C. In general Moscow's princes were almost always willing to share their power with their uncles. D. Over the course of time the Muscovite rules of succession from father to son was relaxed considerably.