P : environmental and psychological stress and strain
Q : he said that
R : the development of positive attitudes to cope with
S : what the world needed today was

The Proper sequence should be:

A. PQSR

B. QSRP

C. RPQS

D. SRPQ

Answer: Option B

Solution(By Examveda Team)

He said that what the world needed today was the development of positive attitudes to cope with environmental and psychological stress and strain.