请看这一部分:...the same radiant young woman whose talent for bublic speaking has won her an ardent following.
这里的whose就是 radiant young woman's,代入到定语从句中就成了radiant young woman's talent for bublic speaking has won her an ardent following. 那么her很明显就是radiant young woman了。
我对OG E.选项的解释存在疑问,它没有从语法的角度上说the rivalry with her charming and cynical cousin Basil Ransom是incorrect的,而只是从句意出发,认为这种说法没有明确Olive是竞争的另一方.rivalry的这种用法在语法上到底是否正确呢?