Which of the following novel aspects of World War I contributed to the action described in the passage?
The Allies’ ability to attack German forces with military aircraft
The capability of British tanks to repel machine-gun fire
The attempt to block supply shipments in the Atlantic by using submarines
The stalemate and high casualties caused by trench warfare on the western front
Let me know if this is right, but I said a because they said the scientific resources was being used against Germany. They didn't say what specific materials/resources so A seems like the most logical answer.
