The heavy toll in the third paragraph was a reference to the casualties of the first war.
The phrase "heavy toll" refers to an idea of unwanted consequences or the outcome brought by a specific incident.
The phrase was used in the paragraph to refer to the fatalities produced in the very first war.
Although, the author also conveys that the rights of every individual must be considered in order to prevent any revolt or war.
Therefore, the Option A is the correct..
Missing options "A. The casualties of the first war B. The deaths that occurred as a result of the use of nuclear weapons during the second war C. The deaths that occurred during the holocaust D.the mass violence that occurred under communist leaders, such as Mao Zedong"
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