Direct answer
Objectives follow journal display order. Some depend on your choices; follow the active objective in the game.
Result
While riding through the village nestled at the base of Kaer Trolde, Geralt spotted a notice posted by a certain Odhen of Rannvaig promising a bounty for information about his missing son. It seemed like a job for a witcher, and since Geralt was, as usual, hard up for coin, he decided to look into it.
