Researchers are investigating the relationship between cell phone use and brain cancer, Of 50 brain cancer patients, 30 admitted to using a cell phone far 10 year or more. Of 400 healthy participants in the study, 250 were found to have used a cell phone for 10 years or more. Which of the following in an appropriate conclusion to draw from this study regarding cell phone us and brain cancer? Select one: O a. The relative risk of cell phone use is 3:8 O b. The odds ratio for cell phone use is 1:0 c. The odds ratio for cell phone use is 9:10 O d. The relative risk of cell phone use by 8 3 Ole. The auributable risk of cell phone use is 1:40