XYZ Cosmetics, Inc Compute Total Delivery Cycle Time for Each Week and Evaluate

XYZ Cosmetics, Inc., has developed a set of nonfinancial measures to evaluate on-time product delivery performance for one of its best-selling cosmetics. The following data have been generated for the past four weeks: $\begin{array}{llll}&\text { Purcliase } & \text { Production }& \\&\text { Order } & \text { Cycle }& \text { Delivery }\\\text { Week } & \text { Lead Time } & \text { Time } & \text { Time } \\1 & 2.4 \text { days } & 3.5 \text { days } & 4.0 \text { days } \\2 & 2.3 \text { days } & 3.4 \text { days } & 3.6 \text { days } \\3 & 2.4 \text { days } & 3.3 \text { days } & 3.4 \text { days } \\4 & 2.2 \text { days } & 3.1 \text { days } & 3.7 \text { days }\end{array}$
Compute total delivery cycle time for each week and evaluate the product delivery performance. Which area still needs management's attention?

A) Purchase order lead time
B) Production cycle time
C) Delivery time
D) None, all have improved over the past four weeks.