Step 1: The improvement in oil content and quality of crops like soybean, oil palm, rapeseed, and sunflower has been achieved through genetic modification. By transferring specific genes, scientists can enhance the oil-producing capacity of these crops.
Step 2:
- (B) Hormones regulate plant growth but do not directly affect oil content.
- (C) Enzymes catalyze biochemical reactions but are not used for transferring oil traits.
- (D) Microorganisms are used in fermentation processes but not for improving oil content in crops.
Conclusion: Genetic transfer of specific genes has led to improvements in oil content and quality.