TOEFL Listening: TPO-TOEFL听力TPO - 02BDS7022HE59H83R$

According to the professor, why were farmers reluctant to create buffer zones near streams? A. They were not convinced that buffer zones effectively control pollution. B. They feared that creating buffer zones might decrease farm income. C. Government approval for creating buffer zones was at first difficult to obtain. D. Planting trees was much more expensive than planting the usual crops.