What is the best statement of the theme of how much land dose a man need by Leo Tolstoy

The correct answer, is b. Becoming greedy, and reaching for too much, can result in losing everything.

Indeed, Pahom becomes too greedy to understand that he already had a very comfortable situation and that he did not need that much land. Because he overreaches for as much land as he can physically cover as he runs, he dies of exhaustion, losing all the good things he already have, including his own life.