I believe it is answer B.
Overloaded breaker, shortage in the wire
Because you could just sit in your trench and wait for the opponent to attack, at which point you could shoot him, throw explosive devices, or even use chemical weapons that weren't banned then.
Answer:
I think the answers are
A. A state can keep ships of war in time of peace.
D. A state can enter into any agreement with a foreign power
B. A state can engage in war
Explanation:
I hope this helps!
B is debatable because A state can't engage in a war without the consent of congress unless it is being invaded or in danger.