Arrange the following former UN Secretary Generals in order of their having hold the office.
A. Dag Hammarskjöld
B. U Thant
C. Boutros Boutros-Ghali
D. Javier Perez de Cuellar
Choose the correct answer from the options given below:

Correct option is C

The correct chronological order of the former United Nations Secretary Generals based on their tenure is as follows:
· Dag Hammarskjöld (A) served from 1953 to 1961.
· U Thant (B) succeeded him and served from 1961 to 1971.
· Javier Pérez de Cuéllar (D) served from 1982 to 1991.
· Boutros Boutros-Ghali (C) served from 1992 to 1996.
Hence, the correct sequence is A, B, D, C.
Information Booster:
1. Dag Hammarskjöld tragically died in a plane crash while in office and was posthumously awarded the Nobel Peace Prize.
2. U Thant was the first non-European UN Secretary-General and oversaw the UN during critical periods like the Cuban Missile Crisis.
3. Javier Pérez de Cuéllar was instrumental in mediating conflicts in Central America and Iran-Iraq during his tenure.
4. Boutros Boutros-Ghali was the first African to become UN Secretary-General and was known for his focus on peacekeeping reforms.