Answer:
The word that best describes the narrator's tone regarding his experiment in the excerpt is businesslike. (Option B)
Step-by-step explanation:
Epistolary in nature, Ted Chiang’s sci-fi short story “Exhalation,” talks about the scientist who dissects his own brain and discovers that it operates because of the "movement of air" through gold leaves.
Through his hypothesis, he understands that when the "atmospheric pressure" is the "same below and above" the ground, then the entire computation and time will itself cease.
He also keeps thinking of how equilibrium is the destiny of all known universes and about the possible existence of all the other universes. He finally realizes that the beauty of life and civilization is a miracle.