A. Trygve Lie, Dag Hammarskjoeld, U Thant, Kurt Waldheim.
B. U Thant, Dag Hammarskjoeld, Trygve Lie, Kurt Waldheim.
C. U Thant, Kurt Waldheim, Dag Hammarskjoeld, Trygve Lie.
D. Trygve Lie, U Thant , Dag Hammarskjoeld, Kurt Waldheim.
✅ The correct answer is option A.
Trygve Lie, Dag Hammarskjoeld, U Thant, Kurt Waldheim is the correct chronological order of names of Secretary-Generals of the UNO.
Trygve Lie, Dag Hammarskjoeld, U Thant, Kurt Waldheim is the correct chronological order of names of Secretary-Generals of the UNO.