Recently, some crop plants were genetically modified to be immune to the effects of weed killers. Which of the following should be determined before planting the resistant crop in fields?

A: Could the gene for resistance be passed on to the subsequent generations of crops?

B: Could the gene for resistance to weed killers pass naturally from the crop plants to weeds?

C: could the gene for resistance increase the yields of the crop as compared to unmodified varieties?

D: Could the gene for resistance negativity affect the genetic diversity of the crop itself?