Answer:
A). "Perhaps the most difficult thing to come to terms with is the scale of death."
Step-by-step explanation:
The central idea is illustrated as the main idea that the author wishes to convey through a particular text. It is the idea that reflects the theme of the work and binds all the elements of a text together and come together as a whole to display the dominant idea.
As per the question, the sentence that best reflects the central idea of the paragraph is displayed through options A and that is 'the most difficult thing to deal with is the scale of death'. It mirrors the dominant idea that surrounds the paragraph as reflected by the description of 'Influenza', 'Elizabethan flu', and 'death rates leading to 7.2 percent as compared to 2.5 percent normally. Thus, option A is the correct answer.