Lower production costs cannot be a reason for reducing supply. As lowering the cost of production not effects in reducing the supply o any commodity.
What is reducing supply?
Reducing supply occurs when there is either high demand of goods and service or if there is no demand of particular thing, in both the case the supply reduces.
Reduces in the supply cause due to many things like reduce in demand, rise in the production cost of the input, enhancement in technology.
Thus, option D is correct.
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