The best and most correct answer among the choices provided by the question is the fourth choice " his father his feeling that his father will more likely succeed if he is not worried about his son his loss of faith in God, which he knows will hurt his father"
Eliezer falsely tells Rabbi Eliahou he has not seen the son, yet, during the run, Eliezer saw the son abandon his father, running ahead when it seemed Rabbi Eliahou would not survive. Eliezer prays that he will never do what Rabbi Eliahou's son did.
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