The form of tumor that is malignant can spread to other body parts. The spreading of tumor is called metastasis. It is the most definite feature of malignant tumor. The correct option is C.
What is metastasis?
Metastasis is the spread of cancer cells from the place where they first identified to another part of the body.
In metastasis, these cells break away from the primary tumor and then travel through the blood or lymph system then finally form a new tumor in other organs or tissues of the body.
Thus, the correct option is C.
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