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Final answer:Investment decisions are usually long-run decisions that involve choosing the amount ofplant and equipment. In the long run, firms can change all factors of production, so this is the period they plan for in terms of equipment and plant investments. The correct answer to the question is option D.Explanation:An investment decision typically involves choosing the amount of plant and equipment, and this is considered along-run decision. The long run in economics is a time period that's long enough for a firm to alter all aspects of its production, including the size of itsphysical plantand the number of workers it employs.In thelong run, firms can make decisions based onanticipated futureconditions, rather than reacting to current conditions. Therefore, the answer to the question is option D: 'The amount of plant and equipment and is a long-run decision.'Learn more aboutInvestment Decisionhere:brainly.com/question/32634980#SPJ11...