Answer:
The paragraph expands the misconception held by Elizabethan England concerning malaria.
Step-by-step explanation:
The Time Traveler's Guide to Elizabethan England is a book written by Ian Mortimer. The book gives a detailed description about Elizabethan lifestyle in England. The book was published in March 2012.
In the given excerpt, the author is shows that how Elizabethans hold on to the misconception regarding malaria. The people thought that the infection spread because of bad air coming from the dark marsh at lower levels. Due to this misconception, the people were not able to bring a proper treatment for it.
Therefore, the author expands the central idea by drawing attention to the misconception held by Elizabethan England concerning malaria.