The correct answer is B. Symbolics.
Symbolics was an American computer company that developed and sold Lisp machines, which were computers designed for artificial intelligence research and development. The company was founded in 1980 by Richard Stallman, Guy Steele, and Gerald Jay Sussman, all of whom were professors at MIT. Symbolics’ first product was the Lisp Machine 1, which was released in 1981. The Lisp Machine 1 was a powerful computer for its time, and it was used by many artificial intelligence researchers. Symbolics continued to develop and sell Lisp machines until the company went out of business in 2009.
The other options are incorrect. LMI was a computer company that developed and sold Lisp machines, but its machines were not considered to be as powerful as Symbolics’ machines. Xerox was a computer company that developed and sold the Alto, which was a personal computer that was used by many artificial intelligence researchers. However, the Alto was not a Lisp machine. Texas Instruments was a computer company that developed and sold a variety of computers, but it did not develop or sell Lisp machines.
In conclusion, the correct answer to the question “Which company offers the LISP machine considered to be “the most powerful symbolic processor available”? is B. Symbolics.