The boy is called Duncan. He sits next to me in class A. The boy whose is called Duncan sits next to me in class
The boy is called Duncan. He sits next to me in class
A. The boy whose is called Duncan sits next to me in class
B. The boy who sits next to me in class is called Duncan
C. The boy whom sits next to me in class is called Duncan
D. The boy to whom he sits next is called Duncan