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D is corrent.  The requirement is to calculate the number of wheels that should be purchased. Assuming that JacKue is planning to produce 200,000 pairs in January and 250,000 pairs in February, and maintains 10% of next month’s production in inventory, the beginning inventory of wheels for January would be expected to be 160,000 wheels (10% × 200,000 pairs × 8 wheels per pair) and the needed inventory at the end of January would be 200,000 wheels (10% × 250,000 × 8 wheels per pair). Production of 200,000 pairs in January would require 1,600,000 wheels (200,000 pairs × 8 wheels per pair).  Therefore, the needed purchases would be 1,640,000 (1,600,000 – 160,000 expected beginning inventory + 200,000 required ending inventory).
A is incorrect. The amount of wheels that should be purchased is 1,640,000. 
A is incorrect. The amount of wheels that should be purchased is 1,640,000. 
A is incorrect. The amount of wheels that should be purchased is 1,640,000.