The graphs illustrate how the percentage of smokers and the number of lung cancer deaths in a country changed between 1950 and 2000. What might have led to the change in the number of deaths from lung cancer between 1950 and 1975?
- Ahigher percentage of smokers after 1950
- Bhigher percentage of smokers before 1950
- Clower percentage of smokers after 1950
- Dlower percentage of smokers before 1950