One of the Few Successful Wartime American Efforts to Save

One of the few successful wartime American efforts to save Jews from perishing in the Holocaust came when

A) Americans helped some German and Austrian Jews seek refuge in neutral Sweden and Switzerland.
B) American Zionist organizations helped Romanian Jews escape to Israel.
C) the U.S. Air Force bombed the rail lines leading to Auschwitz.
D) American agents enabled French Jews to escape across the Pyrenees into Spain.
E) Franklin Roosevelt's War Refugee Board helped some Hungarian Jews escape.