单选题
Which event brought the booming of American candy bar business?
问题1选项
A.The adding of new materials.
B.The demand in the army during WWI.
C.The purchase of new machines.
D.The appearance of smaller candy.
A.The adding of new materials.
B.The demand in the army during WWI.
C.The purchase of new machines.
D.The appearance of smaller candy.
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