Question

a_____is only cancer if it can spread to other parts of the body. blockage infection tumor

Explanation:

To solve this, we analyze each option:

• "blockage" refers to an obstruction, not related to cancer spread.
• "infection" is a disease caused by pathogens, not defined by spreading as cancer.
• "tumor" (specifically malignant tumors) are cancerous when they can metastasize (spread) to other body parts. Benign tumors don't spread, but the context here aligns with tumor's potential to be cancerous via spread.

Answer:

C. tumor (assuming the options are labeled A, B, C with C being tumor; if original labels differ, adjust, but based on content, the correct option is the one with "tumor")