Judith runs a firm that produces materials for adult learners. She recently hired an outside vendor to write assessment items for career placement tests. Through an online presentation, she demonstrated for the vendor how to use her firm’s content management system to enter items into an online assessment bank.

How can Judith BEST determine whether the demonstration was effective?

A) by asking the vendor’s team to critique the demonstration
B) by having the vendor’s team submit sample items for review
C) by asking the vendor’s team to share opinions about the system
D) by having the vendor’s team practice answering questions in the system