Well, several ideas that developed during the renaissance became the basic Ideas of Scientific Revolutions.
For example, the Cart That's created by the Romans became the basic idea in designing the first Cars, a lot of painters such as Da Vinci, created a lot of technological designs for weapons, vehicles, and buildings, etc.
Answer: A
Explanation:
they used astronmy to to develop calendars based based on the movement of stars and planets. B, C, and D are incorrect.
USA had a better navy. (The White Fleet?)
USA was backed by guerrlia warfare in the Philippines.
USA had terrible guns going against the Spanish in the San Juan hill.
The USA Springfield Gun 1892 - 99 side clip was highly inefficient compared to the Spanish Mauser.
The Spanish had more firepower the Maxim beat the Gattling Gun.
Sources such as diaries though not very reliable can be used if there are a large amount of them showing the same date and event. Historical books written about the event especially those closer to the time would be able to help determine that the date is accurate as well.