Why should a scientist use a plasmid with a GFP gene when inserting a new gene?

A) The GFP gene will make cells glow green in ultraviolet lights, confirming that the gene
insertion worked.

B) The GFP gene will remove other genes, making it easier to see the effects of the new
gene.

C) The GFP gene is not well understood, so inserting it would be a valuable experiment all
on its own.

D) The GFP gene will stop the gene insertion from falling apart, making the results more
reliable.