The TWO details from the text best support the answer to Part A are:
It is to be noted that Part A is about the Central Idea of the text: "U.S. Attached by N.R. Kleinfield.
What is a focal thought?
The chief point or feeling that the writer wishes to communicate to the perusers about the issue is the principal thought of a passage. Thus, when the essential idea is enunciated unequivocally in a section, it is communicated in what is known as the subject sentence.
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