Which detail from the text best supports the answer to Part A? 1) A. 'McCarthy capitalized on national paranoia by proclaiming that Communist spies were omnipresent and that he was America's only salvation.' (Paragraph 6) 2) B. 'Half of Europe was under Joseph Stalin's influence, and every time Americans read their newspapers there seemed to be a new atomic threat.' (Paragraph 7) 3) C. 'The public rewarded the witch-hunters by sending red-baiters (communist accusers) before the Senate and the House in 1950.' (Paragraph 11) 4) D. 'Above all, several messages became crystal clear to the average American: Don't criticize the United States. Don't be different. Just conform.'

The detail from the text that best supports the answer to Part A is option D. 'Above all, several messages became crystal clear to the average American: Don't criticize the United States. Don't be different. Just conform.' This detail indicates that one of the main effects of McCarthyism was the promotion of conformity and discouragement of individuality and criticism.

The detail from the text that best supports the answer to Part A is option A. "'McCarthy capitalized on national paranoia by proclaiming that Communist spies were omnipresent and that he was America's only salvation.'" (Paragraph 6)

To determine which detail from the text best supports the answer to Part A, we need to first understand what is being asked for in Part A. Without that information, it is difficult to pinpoint the specific detail.

However, we can analyze each option and explain how to identify the correct answer:

1) Option A provides information about how McCarthy capitalized on national paranoia by claiming Communist spies were omnipresent and that he was America's only salvation. To determine if this option supports the answer to Part A, you would need to understand the context of the question and how McCarthy's action relates to it. By reading the surrounding text and understanding the question, you can determine if this detail is relevant.

2) Option B talks about how half of Europe was under Joseph Stalin's influence, creating a sense of threat for Americans. Again, by relating this information to the question and understanding the context, you can assess its relevance.

3) Option C mentions that the public rewarded the witch-hunters by sending communist accusers before the Senate and the House in 1950. You would need to analyze the question and determine if this detail is connected to the answer.

4) Option D states that several messages became clear for the average American: don't criticize the United States, don't be different, just conform. Once again, understanding the question and its context will help you determine if this detail supports the answer.

In summary, to identify the best supporting detail for Part A, you need to carefully read and analyze the context of the text and how each option relates to the question. Only then can you make an informed decision about which detail provides the strongest support.