Question

union strategy in the civil war
why was the union strategy difficult to carry out?
frequent changes in command
a failing economy
a lack of resources and troops

Explanation:

The problem is about the Union strategy in the Civil War and why it was difficult to carry out. The Anaconda Plan (Union strategy) aimed to blockade Southern ports, control the Mississippi, and divide the South. A blockade of a large coastline (with numerous ports and a sprawling region) required extensive resources (ships, men) and coordination, making "a lack of resources and troops" a key challenge. "Frequent changes in command" was more about leadership transitions, and "a failing economy" was not the primary difficulty in executing the strategy.

Answer:

The option "a lack of resources and troops" (the third blue button option)