Answer:
B. How can farmers use less insecticides on their crops?
Step-by-step explanation:
The scientists were most likely trying to answer question B, "How can farmers use less insecticides on their crops?" The Bt gene from Bacillus thuringiensis produces a protein that is toxic to certain insects, making the plants resistant to insect pests. By introducing this gene into crops, farmers can reduce the need for chemical insecticides, which can be harmful to the environment and human health. This approach is an example of genetic engineering for pest control, which has the potential to increase crop yields while reducing the use of harmful chemicals.