The correct answer is B) a plan of action.
The option that best defines the underlined word (strategy) in the sentence is “a plan of action.”
Many American leaders either helped to plan or execute strategy(a plan of action) in American wars.
A strategy is a plan of action to execute something. In the military, the Armed Forces develop strategies by land, sea, and air in order to execute its military operation in a successful way. They elaborate a plan, establish specific objectives and then prepare the strategy that contains the lines of actions or tactics that would allow accomplishing the goals.