(A) ** Rough Riders
(B) Boxers
(C) Teddy Roosevelt
(D) Imperialists
EXPLANATIONS BELOW
Concept note-1: -Leonard Wood, an Army doctor who served as the medical adviser for both the President and Secretary of War, was appointed colonel of The Rough Riders, with Roosevelt serving as lieutenant colonel.
Concept note-2: -The most famous of all the units fighting in Cuba, the “Rough Riders” was the name given to the First U.S. Volunteer Cavalry under the leadership of Theodore Roosevelt. Roosevelt resigned his position as Assistant Secretary of the Navy in May 1898 to join the volunteer cavalry.
Concept note-3: -Roosevelt recruited a diverse group of cowboys, miners, law enforcement officials, and Native Americans to join the Rough Riders. They participated in the capture of Kettle Hill, and then charged across a valley to assist in the seizure of San Juan Ridge, the highest point of which is San Juan Hill.
Concept note-4: -The 1st U.S. Volunteer Cavalry (Rough Riders), along with the 3rd Cavalry Regiment, began a near simultaneous assault supporting the regulars of the 10th Cavalry (Buffalo Soldiers) up Kettle Hill, supported by the fire of three Gatling guns commanded by Lt. John H. Parker.