The Spanish-American War took place in 1898, which falls in the 1890s. The decade represented by 1890-1899 is the 19th decade. In your options, assuming they correspond to the following decades:
- A = 1800s (the 1st decade)
- B = 1900s (the 2nd decade)
- C = 2000s (the 3rd decade)
- D = 2010s (the 4th decade)
if you are using a standard decade categorization, the closest answer would be "B" for the 1890s (which could be considered the 3rd decade of the 19th century). However, none of the options clearly align with the time frame.
Please provide clarification if those numbers represent a different specific decade system.