A 65-year-old multiparous woman presents complaining of having to spend up to 30 minutes on the commode with difficulty evacuating stool. The problem began with menopause and worsened after a hysterectomy 2 years ago. A routine screening colonoscopy 2 years earlier was unremarkable. Which of the following tests should be performed next?
A. Repeated colonoscopy
B. Anorectal manometry
C. MR defecography
D. Colonic transit study
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