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The recommended screening interval for colorectal cancer in adults over the age of 50 is every 10 years with a colonoscopy. This guideline is supported by major health organizations and is based on evidence that colonoscopy is highly effective in detecting adenomatous polyps and colorectal cancer at an early stage. The 10-year interval is appropriate for individuals at average risk of colorectal cancer.

Colonoscopy has the added benefit of allowing for the removal of polyps during the procedure, which can help prevent the development of colorectal cancer. For adults in this age group without specific risk factors, this long interval balances the benefits of screening with the risks and costs associated with frequent testing.

Other modalities, like stool tests, may serve as acceptable alternatives and can be done at different intervals, but they do not replace the need for a colonoscopy, particularly in the average-risk population. Therefore, while other screening options exist, the colonoscopy every 10 years is the gold standard for this population, making it the correct answer.