Correct option is B
(A) Turned over: This usually means to move something so that a different side is facing up or to change position.
Example: She turned over the pancake to cook the other side.
(B) Turned up: This means to arrive or appear at a place, especially when it is unexpected or after a delay.
Example: He turned up late for the meeting.
(C) Turned around: This can mean to change direction or to change one's attitude or approach.
Example: She turned around to see who was calling her.
(D) Turned in: This usually means to go to bed or to submit something.
Example: He turned in early because he was tired.
Given your sentence, "Everyone agreed to meet at 10:00, but he never...", the best choice is "turned up," meaning he never arrived or appeared at the agreed meeting time. Hence, "Everyone agreed to meet at 10:00, but he never turned up."