48 What is the main idea of the third paragraph?
(A) The invading greeter always performs the body-cross movement first in a social setting.
(B) The home-based greeter performs less body-cross movement in a social encounter.
(C) The greeter and the greeted rarely both perform the body-cross movement towards each other.
(D) The greeters perform the body-cross movement if they are subordinate to the greeted.