Which piece of evidence best illustrates the author's critical tone?A. "It seems the old guard had been worn down — or simply died off." (Paragraph 14)B. "While some husbands may have skipped the stern lectures, it took three more decades for shorts to fully reach widespread acceptance." (Paragraph 16)C. "Time and again, the powers-that-be in tennis push back on immodesty, and the players push forward towards personal choice and — dare we say — personal style." (Paragraph 17)D. "In the big picture, he won't do anything to stop the crawl of social change." (Paragraph 19)

To answer this question, we need to understand what a critical tone is. A critical tone is one that expresses disapproval or critique.

A. "It seems the old guard had been worn down — or simply died off." (Paragraph 14) - This sentence seems more factual than critical. It's stating a possible reason for a change, but not necessarily criticizing anything.

B. "While some husbands may have skipped the stern lectures, it took three more decades for shorts to fully reach widespread acceptance." (Paragraph 16) - This sentence is more informative than critical. It's explaining a historical fact about the acceptance of shorts.

C. "Time and again, the powers-that-be in tennis push back on immodesty, and the players push forward towards personal choice and — dare we say — personal style." (Paragraph 17) - This sentence could be seen as critical. The author is criticizing the "powers-that-be" in tennis for their resistance to change and their pushback against "immodesty".

D. "In the big picture, he won't do anything to stop the crawl of social change." (Paragraph 19) - This sentence is also critical. The author is criticizing an individual (presumably someone in power) for their inability to stop social change.

So, the best pieces of evidence that illustrate the author's critical tone are C and D. However, if we have to choose one, I would say option C is the best. It criticizes a group (the powers-that-be in tennis) rather than an individual, and it does so in a way that suggests the author disapproves of their resistance to change and personal style.