Best Buy Has Recently Become Unhappy with the Manufacturer of the New

Best Buy has recently become unhappy with the manufacturer of the new Suri4 smartphone. Best Buy feels that not only are the shipments for the Suri4 taking longer, but the phones are of lower quality than the Suri3 and cost much more as well. Why is this likely to be occurring?

A) the manufacturer's ability to handle an increased capacity
B) a short product line
C) the mismanagement of a long product line
D) automatic production technology employed by the manufacturer