Answer:
A) the need to improve glaring deficiencies in the army.
Step-by-step explanation:
The Spanish-American War revealed to American military planners cross out the need to improve glaring deficiencies in the army.
The Spanish-American War was a conflict between the United States and Spain in 1898 and it ended Spanish colonial rule in the Americas and resulted in U.S. acquisition of territories in the western Pacific and Latin America.