C is not true exactly, unless you define tissue as a region. Cancer cells spread into healthy tissue, start to replicate, tumors compete with normal tissue for nutrients, can crowd out normal tissues. That is not exactly turning existing tissue into cancerous cells, but it has almost that meaning.
So I think C is the best answer.
On answer D, "destroy" is not correct, unless competing for nutrients can be considered "destroying".
I am not keen on either C or D, because both are sloppy with meaning. A and B are wrong.
Why are cancerous tumors harmful?
They can change from malignant to benign.
They can never be removed from the body.
They turn existing healthy tissue into cancerous cells.
They invade and destroy the surrounding healthy tissues.
My answer is C
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