I believe that it is B however, I'm not positive.
Answer:
Explanation:
If I'm being 100% honest I just rlly need points so you are more than welcome to skip this bc the answer will not be here sorry :/
The main reason why the US joined the war was because multiple attack on passenger and merchant ships with submarine attacks .The final straw was when the RMS Lusitania by a German u-boat going to Liverpool England .
(A) The office is led by the chief of staff, who serves as a key adviser to the president.