Final answer:
The Union's naval blockade was highly successful and played a critical role in undermining the Confederate economy by preventing trade, causing shortages, and contributing to inflation, effectively supporting option A) in its evaluation.
Step-by-step explanation:
The Union's naval blockade on the Atlantic coast was a crucial strategy during the Civil War and was largely successful in hampering the Confederate economy. As the blockade intensified over time, it restricted the Confederate trade, significantly reducing the export of cotton to England and limiting the import of essential goods and war materials. This strategic move contributed to an array of economic woes for the South, including rampant inflation and shortages of goods necessary for both civilian life and military operations.
Confederate hopes that Britain and France would continue to purchase cotton were dashed as these countries found alternative sources. The South's reliance on cotton exports failed to bring the anticipated financial and diplomatic support, leaving it economically isolated. Moreover, the lack of industry and efficient internal transportation compounded the difficulties faced due to the blockade, making the movement and production of goods increasingly challenging.
Given these factors, the success of the Union's naval blockade can be better evaluated as highly effective, aligning with option A), as it significantly crippled the Confederate economy, leading to shortages and inflation, thus playing a pivotal role in the Union's ultimate victory.