The correct answer is D.
When Andrew Johnson was impeached, the House approved the articles and forwarded the to the Senate. The Senate failed to convict Johnson by a single vote, due to a seven Republicans votes not guilty to stop imbalance in the three branches.
Answer:
Unrestricted submarine warfare is a type of naval warfare in which submarines sink merchant ships and tankers without warning. I don't know what you want for an example, but Germany used it in World War 1.
Since both equations equal y you can do

. then do:

and then you get: