The sharp decline in the mortality since 1941 shows that who

[m.gayatri]

The sharp decline in the mortality since 1941 shows that who argue that the introduction of new chemicals has caused serve health problems are mistaken from 1940-1979, the average life expectancy for the entire United States population increased from 63.6 to 73.6 years, and the total age adjusted death rate declined by forty five percent, including decline in every age, sex and racial group. There were also the years in which there was a dramatic increase in the use of new chemicals in this country. Clearly, then those modern aids to industry have no adverse effects on the general health of society.
Q:- Which of the following is an assumption underlying the conclusion of the passage above?
A) The increase in life expectancy in the United States was paralleled by corresponding increases in other countries.
B) The growth in the average life expectancy in the United States cannot be attributed to any single factor , but is a general phenomenon.
C) The increase in life expectancy would not have been greater if there had not been an increase in the use of chemicals.
D) Growth in the use of chemicals was a crucial factor in the development of industry from 1940-1979.