The opportunity cost of retaining money, as per liquidity preference theory, is Option D.
Liquidity Preference Theory is a model that proposes that an investor should seek a higher interest rate or premium on assets with extended maturities that involve higher risk because, all else being constant, investors seek cash or other extremely liquid assets.
According to Liquidity Preference Theory, investors seek progressively bigger premiums on medium and long-term securities against short-term securities.
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