Concept:The correct phrase indicates people coming together for an event, meeting, or activity.Explanation:"Turned out" means to go somewhere in order to attend a meeting, vote, play in a game, or join an occasion.The other choices do not fit this meaning: "turned off" means switched off or left a route, "turned in" means handed something over or went to bed, and "turned by" is not a suitable phrasal verb here.Thus, the sentence requires the phrase "turned out."Answer:D. turned out