​Which of these best explains the recent drop in cancer death rates in the U.S.?

A) ​Better procedures for treatment of cancer
B) ​Better techniques for diagnosis of cancer
C) ​Changes in the lifestyles of many citizens
D) ​Both a and c have contributed to this drop

Both better procedures for treatment of cancer and changes in the lifestyles of many citizens have contributed to the drop in cancer death rates in the U.S. Improved treatments, such as targeted therapies and immunotherapy, have allowed for more effective management of cancer. Additionally, greater awareness of the importance of healthy lifestyle choices, including regular exercise and a balanced diet, has led to a decrease in certain cancer risk factors such as obesity and smoking.