A 69-year-old female patient with no medical comorbidities is seen in the clinic for a biopsy-proven adenocarcinoma of the sigmoid colon found on a screening colonoscopy. Staging computed tomography (CT) showed a solitary 3-cm hepatic lesion in segment 5, which was biopsied and also showed adenocarcinoma consistent with colon primary. No other sites of metastasis are identified. Which of the following treatment options will provide the highest cure rate for liver metastasis?