The correct answer is "D":
Due to the abundance of rivers in the tropical area where the Mayans were settled, this allowed for the development of highly skilled fishermen. Fish were caught with the use of tools like nets and lines. As seen in ancient Asian culture, Mayans also trained cormorants. These birds will search and hunt fish. However, since their necks were tied they were not able to swallow the bigger ones. They would then bring their preys back to the fishermen.