Write the next sentence in the following story.

How to prepare for a colonoscopy
Understand the purpose of a colonoscopy.
Colonoscopy is the best technology available for determining whether cancerous or precancerous growths called polyps are present in the colon. Early detection can enable patients to get the treatment they need to prevent growths from advancing to the next stage.

Select from: (a). Colonoscopy only allows the healthcare provider to take tests on cancerous growths as a part of treatment. The average physician should consider a colonoscopy to control cancerous growths and determine whether polyps are present.; (b). Know that colonoscopy enhances the way most patients experience symptoms. Colonoscopy increases blood flow to the colon, which can reduce cancerous growth.; (c). The american cancer society recommends that people over age 50 should have a colonoscopy every 10 years. Those who are at increased risk of getting colon cancer should have the test done more frequently.; (d). The effectiveness of an colonoscopy is more important than the accuracy of the results. Your doctor may suggest : A colonoscopy is a professional procedure that helps to assess and treat growths.;. The answer should be
(c).