To determine DeConcini's main purpose in the text, we would need to analyze the context and content. However, based on the options provided and common themes in discussions about equal rights, I would suggest that the best answer is:
D. to explain why equal rights are important to the country.
This option aligns with a common goal in advocacy and legislative discussions regarding the importance of equal rights in promoting social justice and national unity. If you have specific excerpts or details from the text, that would help refine the assessment further.