Why does the author mention "mustard weed species" in the discussion of plants that hybridize? A. To give an example of a weed that may become resistant to glyphosate due to hybridizing with a transgenic plant B. To argue that creating transgenic plants in the laboratory is not always necessary, as some can be created through hybridizing in the fields C. To provide evidence that competition from related species of plants can be a serious problem for transgenic plants D. To support the claim that it is difficult to determine whether or not a crop plant has been planted a safe distance from weedy relatives