He argued that world 1 and world 2 interact, world 2 and world 3 interact, and world 3 and world 1 interact () world 2.

题目：He argued that world 1 and world 2 interact, world 2 and world 3 interact, and world 3 and world 1 interact () world 2.

A．between
B．individuals
C．However
D．through