At the end of chapter nine who does Alice consider the cause of all the mischief is explained below in detail.
Explanation:
Review. After the withdrawal of the Cheshire Cat, the croquet competition commences up again and the Duchess takes Alice's arms. ... They move into the Queen, who sternly commands the Duchess off and suggests Alice continue the croquet competition. In limited time, the Queen narrows the croquet match down to Alice, the King, and herself.
I would say that the theme that Leo Tolstoy explores in this excerpt from The Death of Ivan Ilyich is that C) human mortality is inevitable, and it is important to live an authentic life.