The correct answer is "Parents refused to care for their dying children".
The situation to which the narrator is referring to as "even worse, and almost incredible" during the plage, is that parents were abandoning their suffering children. <u>This is what he found to be the most poignant and striking image that conveyed the extent of the horrors brought by the plague</u>. Mothers and fathers refused to care for their dying children or even visit them in innumerable cases.
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The d day invasion was when the allies landed in normandy France this marked the turning point the the Pacific theater as it caused Germany to lose this part of France and this paved the way to a full scale invasion of Germany in 1945 that wouldn't of been possible without this beach landing
Some group from the north wanted to punish the south.