Answer:
D heartbreaking
Step-by-step explanation:
In literature, tone represents the author's attitude about a particular subject. We can figure out which tone the author is using based on his word choice, point of view, etc. When we talk about the tone of a particular piece of literature, we could, for instance, analyze if the story has a sad, melancholic, serious, cheerful, or sarcastic tone. In this excerpt from "When Birds Get Flu and Cows Go Mad!", the word "heartbreaking" best describes the tone of the passage. It reveals how the author feels about a particular situation described in the text. Words cost, businesses ,and affected are not essential for the tone of the passage.