A manufacturing project has a schedule performance index (SPI) of 0.89 and a cost performance index (CPI) of 0.91. Generally, what is the BEST explanation for why this occurred?

A. The scope was changed
B. A supplier went out of business and a new one needed to be found
C. Additional equipment needed to be purchased
D. A critical path activity took longer and needed more labor hours to complete

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D. A critical path activity took longer and needed more labor hours to complete
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