Final answer:
Sections a) and b) best support the answers to Part A by emphasizing the impact of rising water, widespread devastation, and breached levees on rescue and recovery efforts.
Step-by-step explanation:
The two sections that best support the answers to Part A are a) As rising water and widespread devastation hobbled rescue and recovery efforts, the authorities could only guess at the death toll in New Orleans and across the Gulf Coast. (Paragraph 4) and b) It was not the water from the sky but the water that broke through the city's protective barriers that changed everything for the worse. (Paragraph 9)
In paragraph 4, it is mentioned that the rising water and widespread devastation made rescue and recovery efforts difficult. This supports the idea that the hurricane had a major impact on the region. In paragraph 9, it is stated that the water that broke through the city's protective barriers worsened the situation, emphasizing the role of breached levees in the disaster.