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Answer (D) is correct . John Maynard Keynes, founder of Keynesian economics, concluded that there were three major motives for holding cash: for transactional purposes as a medium of exchange, precautionary purposes, and speculative purposes (but only during deflationary periods).

Answer (A) is incorrect because These are not the three major motives for holding cash according to Keynesian economics.
Answer (B) is incorrect because These are not the three major motives for holding cash according to Keynesian economics.
Answer (C) is incorrect because These are not the three major motives for holding cash according to Keynesian economics.