Final answer:
The preferred method of purchase for the base commander to send 25 employees to the time-management seminar would be the b) Government Purchase Card (GPC).
Step-by-step explanation:
The preferred method of purchase for the base commander to send 25 employees to the time-management seminar would be the b) Government Purchase Card (GPC).
The GPC is a credit card issued to government agencies that allows them to make purchases for official business purposes.
It provides an efficient and streamlined process for making small purchases, such as the $75 cost per employee for the seminar.
Using the GPC would eliminate the need for more complex purchasing methods like Purchase Orders or Simplified Acquisition Procedure, and it would be easier to track and manage the expenses.