S₁: In the eighteenth century people expected most of their children to die before they were grown up.
P: Improvement began at the beginning of the nineteenth century, chiefly owing to vaccination.
Q: The general death rate in 1948(10.8) was the lowest ever recorded up to that date.
R: In 1920 the infant mortality in England and Wales was 80 per thousand, in 1948 it was 34 per thousand.
S: It has continued ever since and is still continuing.
S₆: There is no obvious limit to the improvement of health that can be brought about by medicine.

The Proper sequence should be:

A. PSRQ

B. QRPS

C. RQPS

D. SPQR

Answer: Option A

Solution(By Examveda Team)

Improvement began at the beginning of the nineteenth century, chiefly owing to vaccination. It has continued ever since and is still continuing. In 1920 the infant mortality in England and Wales was 80 per thousand, in 1948 it was 34 per thousand. The general death rate in 1948(10.8) was the lowest ever recorded up to that date.