The most likely benefit of inserting a gene that codes for resistance to a biodegradable weedkiller into a plant is: c The plant is more likely to survive when exposed to the weedkiller.
This option aligns with the purpose of introducing such a gene, which is to enhance the plant's ability to tolerate or withstand the effects of the weedkiller, allowing it to thrive while the biodegradable weedkiller targets unwanted weeds.