The use of submarines during World War I had which of these effects?
It gave an advantage to the coastal nations.
It made naval battles the key battles of the war.
It made it difficult for merchants to bring supplies to the Allies.

Question

The use of submarines during World War I had which of these effects? 
 It gave an advantage to the coastal nations. 
 It made naval battles the key battles of the war. 
 It made it difficult for merchants to bring supplies to the Allies.

anonymous · Answer

I think It would Be  B. I don't recall anything like A.

anonymous · Answer

That's what I thought... Thanks again((: Lol

anonymous · Answer

Although they are both Good choices, I'm more inclined toward B. Thanks!!!