Final answer:
In excerpt A, 'challenges' is a noun referring to difficulties in a project. In excerpt B, 'challenge' is a verb indicating the act of pushing oneself to face difficult tasks.
Step-by-step explanation:
In excerpt A, the word 'challenges' is used as a noun. It refers to difficulties or obstacles that a director and design team may encounter while working on a project. For example, the challenges could include limited budget, strict deadlines, or technical limitations.
In excerpt B, the word 'challenge' is used as a verb. It refers to the act of pushing oneself to take on something difficult or unfamiliar in order to improve or test one's skills. The person in the excerpt enjoys taking on projects that challenge her because they allow her to learn and grow.
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