Final answer:
The secretary's tone in responding to Edward, given the straightforward and unemotional nature of the dialogue, is best described as (d) matter-of-fact.
Step-by-step explanation:
The question pertains to identifying the tone of speech used by a secretary while responding to a character named Edward. In the provided dialogue, the secretary's tone is described as a response to Edward's grunt when he arrives at the office expecting to see Dr. Lewis.
The secretary confirms Dr. Lewis is expecting Edward and instructs him to go in. Considering the context and phrasing, the secretary's tone is best described as matter-of-fact. This tone implies a straightforward, unemotional, and informative response to Edward's statement.