Structural unemployment results due to
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a change caused by the introduction of new machines, labour saving devices and improvement in methods of production
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a change caused by recessionary and depressionary phases of the economy
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a change caused by high population growth, primitive state of technology, low capital formation and vicious circle of poverty etc.
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a change caused by a decline in demand for production in a particular industry and consequent disinvestments and reduction in its manpower requirement
Structural unemployment occurs from fundamental shifts in the economy causing long-term job losses in specific industries. Option D describes this: declining demand in a particular industry leads to disinvestment and reduced workforce. Options A, B, and C describe technological, cyclical, and chronic unemployment respectively.