Final answer:
In excerpt A, 'challenges' is a noun that refers to interesting or difficult tasks. In excerpt B, 'challenge' is also a noun and it means an interesting or difficult task.
Step-by-step explanation:
In excerpt A, the word 'challenges' is used as a noun and it means interesting or difficult tasks. It refers to the possible obstacles or problems that the director and design team may encounter while working on a particular project.
In excerpt B, the word 'challenge' is used as a noun. It also means an interesting or difficult task. In this context, the speaker is referring to projects that are unknown or unfamiliar to her, which she finds particularly engaging.
Learn more about the meaning and part of speech of the word 'challenge'