Of all the languages referred to in the passage, the two programming languages which are less efficient than others in some respects are
a. Haskell and Julia
b. Python and Prolog
c. Lisp and R
d. Prolog and C++

The correct answer is Option C (b only).

Key Points:
• Passage Reference: The passage notes:
• 1. Prolog: *"used sporadically and the chances of coming into contact with a professional Prolog programmer are slim."*
• 2. Python: *"Python does support some functional features but it is not enough"* and *"Speed is one of the important reasons why you should prefer Julia over Python."*
• Explanation: Python and Prolog are described as having certain limitations/inefficiencies compared to specialized high-performance counterparts. Statement 'b' corresponds to Option 3 ('b only').
• Official Key: Option 3 is the official answer given in MPSC Final Answer Key.
• Key Takeaway: Remember: Paragraph details highlight the limitations of Python and Prolog in comparison to specialized alternatives.