What was the cause of death of the greatest number of American soldiers during the Spanish-American War?

Battle of Manila Bay

Battle of San Juan Hill

disease, including yellow fever

invasion of Puerto Rico

Diseases, such as yellow fever, were the number one cause of death and the actual enemies during the Spanish-American War. The war claimed the lives of nearly 3,000 American soldiers, but only a small amount actually died in combat. Meaning, the diseases were what actually killed most soldiers. So you answer is C, diseases such as yellow fever.