Which of the following categories does surgery for removal of a cancerous tumor fall under?

Surgery for the removal of a cancerous tumor falls under ablative surgery because this type of surgical procedure involves the removal of tissue or organs that are affected by disease, in this case, cancer. Ablative surgery is specifically aimed at excising or destroying abnormal tissue to alleviate symptoms or eradicate a disease process, such as cancer.

In the context of surgical procedures, ablative surgery is often performed with the intent to achieve a cure or improve the patient's condition by removing the tumor along with surrounding necessary margins of healthy tissue. This differentiates it from other surgical categories, where constructive surgery focuses on rebuilding or repairing tissues, transplant surgery involves replacing a failing organ or tissue with healthy ones from a donor, and diagnostic surgery is primarily aimed at determining the nature of a disease, rather than treating it. In the case of cancerous tumors, the definitive action is to remove the cancerous tissue, thus categorizing it accurately as ablative surgery.