One difference between cancer cells and normal cells is that ...

[curlz]

One difference between cancer cells and normal cells is that cancer cells
A) are unable to synthesize DNA.
B) are arrested at the S phase of the cell cycle.
C) continue to divide even when they are tightly packed together.
D) cannot function properly because they are affected by density-dependent inhibition.
E) are always in the M phase of the cell cycle.

[coco]

Go with C, I'm pretty sure it's that.

[curlz]

Great..that really helped.