Please help with this question!

in "The most dangerous Game" On the first day of the hunt, Zaroff spots Rainsford's hiding spot. Why does he smile and walk away?
Group of answer choices

He thinks he has found another trail.

He wants to save him to hunt another day as to prolong the game.

He is satifisfied with his effort that day and decides he is hungry.

He believes it to be a trap.