题目选项分析

Some scientists believe that sugar causes a specific type of pancreatic cancer. They have found that people who consume at least 2 carbonated drinks containing sugar per day have a 90% higher rate of pancreatic cancer than those who drink the same number of diet drinks per day. Therefore, if we were to substitute diet drinks for regular soda pop, it would considerably reduce our chances of getting pancreatic cancer.

Which of the following, if true, most seriously weakens the argument above.

【选项】Statistically, people who consume several sugared drinks a day are also the least likely to maintain a regular exercise regimen It has been shown that regular exercise is a factor in reducing the pancreatic cancer