MacLean (1990, 1993) Proposed That the Human Forebrain Includes Three

MacLean (1990, 1993) proposed that the human forebrain includes three distinct systems, each of which developed in a distinct phase of vertebrate evolution. According to MacLean, the limbic system is:

A) the system that coordinates social greeting and grooming.
B) what allows maternal caregiving with infant attachment, vocal signaling, and play, all of which are activities that occur in mammals but not in reptiles.
C) the stream of thinking.
D) all of the above.