Direct answer
Objectives follow journal display order. Some depend on your choices; follow the active objective in the game.
Result
Keira Metz had helped Geralt in his search for Ciri, so the witcher decided to return the favor. The sorceress sought a magic lamp which the mysterious elven mage had promised to give her. Since the object was nowhere in sight, our heroes drew the only possible conclusion: that it lay concealed somewhere in the underground passageways.
