The original LISP machines produced by both LMI and Symbolics were based on research performed at:

Solution (By Examveda Team)

The original LISP machines produced by both LMI (Lisp Machines, Inc.) and Symbolics were based on research conducted at the Massachusetts Institute of Technology (MIT).
MIT played a significant role in the development of LISP and its associated hardware, leading to the creation of dedicated LISP machines.
Option A: CMU (Carnegie Mellon University) and Option C: Stanford University were not the institutions where the original research for LISP machines was performed.
Option D: RAMD is not a known research institution relevant to the development of LISP machines.
Therefore, the correct choice for the institution where the research for the original LISP machines was conducted is Option B: MIT.