The president is always top adviser, therefore he is the Head of State of and the Head of the Government of the United States.
Great Britain and Russia differed in military strategy because Great Britain centered on ground forces, while Russia developed its navy.
<h3>What are the ground forces and navy?</h3>
During World War II, The Army Ground Forces were one of the three independent elements of the Army of the United States, some other existing the Army Air Forces and Army Service Forces.
End-to-end of their existence, Army Ground Forces were the large-scale training organization of all time established in the US and the Great Britain also focus on ground forces as a military strength before World War I.
The US's Navy is the transportation service branch of the US Armed Forces and one of the eight clad services of the US, as a military strength Russia also developed their Navy before the time of World War I.
Therefore, option B is correct.
Learn more about the ground forces and navy, refer to:
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C - They had a rivalry during that time
Answer: Germany declared on Russia. Russia was also allies with Serbia.
Explanation: