Refer to the graph below, which shows the change in human life expectancy since 1840.(Values after 2000, indicated by a dashed line, are extrapolated.) 
Which statement best expresses the reasons behind this continuing increase in life expectancy?
A) Humans have evolved very rapidly, leading to genetic change that is increasing the life span.
B) As in all such changes, genetics and environment are equally responsible for the changes in life span.
C) Health care and nutrition have improved greatly, leading to increased life spans within the range of current human genetics.
D) Life expectancy is much higher in some countries than in others, causing a wide variation in life expectancy through the century.
E) Environmental factors have acted as the catalyst for increased life spans, but some genetic change is necessary to cause the resulting change.
Correct Answer:
Verified
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