Concept:The sentences must be arranged in chronological order based on the events in Chinua Achebe's life.
Explanation:S1 introduces Achebe's birth and education, ending in 1930.
Sentence S mentions his BA in 1953 and BBC training in 1954 — these are the earliest events after S1.
Sentence R follows with his job at the Nigerian Broadcasting Company in 1956.
Sentence P describes his work for the Biafran government during the Civil War (1967–1970).
Sentence Q comes last, as it refers to his appointment after the war.
Thus the correct order of the middle four sentences is S, R, P, Q.
Checking the options, only option A (SRPQ) matches this sequence.
Answer:The correct sequence is SRPQ, which corresponds to option A.