Final answer:
The suffix that means "incision into" is '-tomy', as seen in medical terms like laparotomy. The correct multiple-choice answer is D. -tomy.
Step-by-step explanation:
The suffix that means "incision into" is -tomy. This is a common suffix in medical terminology. For example, in the term laparotomy, which means incision into the abdominal cavity, the suffix -tomy indicates the surgical act of cutting or making an incision. Therefore, the correct answer to the question is D. -tomy.
In contrast, the suffix -stomy denotes the creation of an opening or mouth, such as in colostomy, the creation of an opening into the colon. The suffix -ectomy means the surgical removal of a part, like in appendectomy, the surgical removal of the appendix. Finally, the suffix -plasty refers to the molding, grafting, or forming of a body part, evident in the term rhinoplasty, which is the surgical reconstruction or reshaping of the nose.