What actions made it most difficult to slow down the progression to all-out war in europe in 1914?

Which best explains why the allies employed the europe first strategy during world war ii? a.japan was a greater threat than germany to the allies. b.japan received military assistance from germany, so the allies needed to defeat germany first. c.the allies wanted to ensure that germany did not continue to conquer european territory. d.the allies needed japan’s vast stockpile of weapons to defeat germany.