Final answer:
An in situ cancer is an early stage cancer that is localized to the place where it started and has not spread to nearby tissues or other organs. It does not exhibit invasion of nearby tissues, unlike invasive cancers. However, if left untreated, an in situ cancer has the potential to become invasive.
Step-by-step explanation:
The answer to this question is A) Invasion of nearby tissues. An in situ cancer, also known as carcinoma in situ, is an early stage cancer that is localized to the place where it started and has not spread to nearby tissues or other organs. It is characterized by abnormal cells that are present but have not invaded surrounding tissues.
However, it is important to note that while an in situ cancer does not exhibit invasion of nearby tissues, it does have the potential to become invasive if left untreated. This is why it is crucial for early detection and treatment of in situ cancers.