Unfortunately, Kain wouldn't be able to take away all 3 objects. He'd already heard upon entering that every once in a while entrants will also be given a choice among multiple rewards instead of just given one chosen for them by the relic.
Kain was quite lucky that he was being given this opportunity after his very first trial.
There were 3 objects available for selection on ornate golden pedestals, all of which he assumed were evolutionary materials suitable for his respective contracts.
The one on the left was a bright green crystal that emitted life-attribute energy—for Eve and Queen's evolution most likely.