The correct answer is D. Was short and successful for the United States.
The Spanish-American War (1898) lasted a very short amount of time. The US and Spain declared war on each other in April of 1898. By August 2nd, of 1898, the Spanish and US were already discussing a treaty to end this war.
This war was considered a success for the United States because they freed Cuba from the brutal reign of the Spanish and they received territories such as Guam, Puerto Rico, and the Philippines.